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              "content": "```python\n# CODING_FIXTURE: merge_intervals\ndef merge_intervals(intervals):\n    if not intervals:\n        return []\n    sorted_intervals = sorted(intervals, key=lambda x: (x[0], x[1]))\n    result = [[sorted_intervals[0][0], sorted_intervals[0][1]]]\n    for i in range(1, len(sorted_intervals)):\n        s, e = sorted_intervals[i]\n        if s <= result[-1][1] + 1:\n            if e > result[-1][1]:\n                result[-1][1] = e\n        else:\n            result.append([s, e])\n    return result\n```",
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              "content": "```python\n# CODING_FIXTURE: merge_intervals\ndef merge_intervals(intervals):\n    if not intervals:\n        return []\n    sorted_intervals = sorted(intervals, key=lambda x: (x[0], x[1]))\n    merged = [list(sorted_intervals[0])]\n    for i in range(1, len(sorted_intervals)):\n        start, end = sorted_intervals[i]\n        if start <= merged[-1][1] + 1:\n            if end > merged[-1][1]:\n                merged[-1][1] = end\n        else:\n            merged.append([start, end])\n    return merged\n```",
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              "content": "```python\n# CODING_FIXTURE: merge_intervals\ndef merge_intervals(intervals):\n    if not intervals:\n        return []\n    sorted_intervals = sorted(intervals)\n    merged = [list(sorted_intervals[0])]\n    for i in range(1, len(sorted_intervals)):\n        start, end = sorted_intervals[i]\n        if start <= merged[-1][1] + 1:\n            if end > merged[-1][1]:\n                merged[-1][1] = end\n        else:\n            merged.append([start, end])\n    return merged\n```",
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              "content": "```python\n# CODING_FIXTURE: stable_toposort\ndef stable_toposort(nodes, edges):\n    node_set = set(nodes)\n    node_index = {n: i for i, n in enumerate(nodes)}\n\n    for before, after in edges:\n        if before not in node_set or after not in node_set:\n            return None\n\n    seen = set()\n    unique_edges = []\n    for e in edges:\n        if e not in seen:\n            seen.add(e)\n            unique_edges.append(e)\n\n    in_degree = {n: 0 for n in nodes}\n    adjacency = {n: [] for n in nodes}\n    for before, after in unique_edges:\n        adjacency[before].append(after)\n        in_degree[after] += 1\n\n    result = []\n    remaining = set(nodes)\n\n    while remaining:\n        ready = [n for n in remaining if in_degree[n] == 0]\n        if not ready:\n            return None\n        chosen = min(ready, key=lambda n: node_index[n])\n        result.append(chosen)\n        remaining.discard(chosen)\n        for neighbor in adjacency[chosen]:\n            in_degree[neighbor] -= 1\n\n    return result\n```",
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              "content": "```python\n# CODING_FIXTURE: stable_toposort\ndef stable_toposort(nodes, edges):\n    node_set = set(nodes)\n    node_index = {n: i for i, n in enumerate(nodes)}\n\n    for before, after in edges:\n        if before not in node_set or after not in node_set:\n            return None\n\n    adj = {n: [] for n in nodes}\n    in_degree = {n: 0 for n in nodes}\n    seen = set()\n\n    for before, after in edges:\n        if (before, after) not in seen:\n            seen.add((before, after))\n            adj[before].append(after)\n            in_degree[after] += 1\n\n    ready = [n for n in nodes if in_degree[n] == 0]\n    result = []\n    processed = 0\n    total = len(nodes)\n\n    while ready:\n        best = ready[0]\n        for n in ready[1:]:\n            if node_index[n] < node_index[best]:\n                best = n\n        ready.remove(best)\n        result.append(best)\n        processed += 1\n\n        for neighbor in adj[best]:\n            in_degree[neighbor] -= 1\n            if in_degree[neighbor] == 0:\n                ready.append(neighbor)\n\n    if processed != total:\n        return None\n\n    return result\n```",
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              "content": "```python\n# CODING_FIXTURE: parse_csv_line\ndef parse_csv_line(line):\n    n = len(line)\n    i = 0\n    fields = []\n\n    while True:\n        if i < n and line[i] == '\"':\n            i += 1\n            chars = []\n            closed = False\n            terminated_by_comma = False\n            while i < n:\n                if line[i] == '\"':\n                    if i + 1 < n and line[i + 1] == '\"':\n                        chars.append('\"')\n                        i += 2\n                    elif i + 1 < n and line[i + 1] == ',':\n                        closed = True\n                        terminated_by_comma = True\n                        i += 2\n                        break\n                    elif i + 1 == n:\n                        closed = True\n                        i += 1\n                        break\n                    else:\n                        return None\n                else:\n                    chars.append(line[i])\n                    i += 1\n            if not closed:\n                return None\n            fields.append(''.join(chars))\n            if not terminated_by_comma:\n                break\n        else:\n            chars = []\n            ended_by_comma = False\n            while i < n:\n                if line[i] == ',':\n                    i += 1\n                    ended_by_comma = True\n                    break\n                elif line[i] == '\"':\n                    return None\n                else:\n                    chars.append(line[i])\n                    i += 1\n            fields.append(''.join(chars))\n            if not ended_by_comma:\n                break\n\n    return fields\n```",
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              "content": "```python\n# CODING_FIXTURE: parse_csv_line\n\ndef parse_csv_line(line):\n    fields = []\n    i = 0\n    n = len(line)\n\n    while True:\n        if i >= n:\n            fields.append('')\n            break\n\n        if line[i] == '\"':\n            i += 1\n            current = []\n            while True:\n                if i >= n:\n                    return None\n                if line[i] == '\"':\n                    if i + 1 < n and line[i + 1] == '\"':\n                        current.append('\"')\n                        i += 2\n                    else:\n                        i += 1\n                        break\n                else:\n                    current.append(line[i])\n                    i += 1\n            fields.append(''.join(current))\n\n            if i < n and line[i] != ',':\n                return None\n            if i < n:\n                i += 1\n            else:\n                break\n        else:\n            current = []\n            while i < n and line[i] != ',':\n                if line[i] == '\"':\n                    return None\n                current.append(line[i])\n                i += 1\n            fields.append(''.join(current))\n\n            if i < n:\n                i += 1\n            else:\n                break\n\n    return fields\n```",
              "content_chars": 1264,
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              "content": "```python\n# CODING_FIXTURE: apply_edits\ndef apply_edits(text, edits):\n    n = len(text)\n    validated = []\n    for e in edits:\n        try:\n            start, end, replacement = e\n        except (TypeError, ValueError):\n            return None\n        if not isinstance(start, int) or isinstance(start, bool):\n            return None\n        if not isinstance(end, int) or isinstance(end, bool):\n            return None\n        if start < 0 or end > n or start > end:\n            return None\n        if not isinstance(replacement, str):\n            return None\n        validated.append((start, end, replacement))\n    validated_sorted = sorted(validated, key=lambda x: x[0])\n    for i in range(len(validated_sorted) - 1):\n        if validated_sorted[i + 1][0] < validated_sorted[i][1]:\n            return None\n    parts = []\n    prev = 0\n    for start, end, repl in validated_sorted:\n        parts.append(text[prev:start])\n        parts.append(repl)\n        prev = end\n    parts.append(text[prev:])\n    return ''.join(parts)\n```",
              "content_chars": 1027,
              "content_excerpt": "```python\n# CODING_FIXTURE: apply_edits\ndef apply_edits(text, edits):\n    n = len(text)\n    validated = []\n    for e in edits:\n        try:\n            start, end, replacement = e\n        except (Type",
              "failure_class": null,
              "finish_reason": "stop",
              "latency_ms": 10273.648399999729,
              "reasoning_chars": 10408,
              "reasoning_excerpt": "Let me carefully analyze the requirements:\n\n1. Define exactly `def apply_edits(text, edits):`\n2. Each edit is a three-item tuple `(start, end, replacement)` with integer offsets into `text` and a stri",
              "reasoning_field": "reasoning_content",
              "reasoning_tokens": 2928,
              "status": "passed",
              "text_checks": [
                {
                  "name": "marker",
                  "passed": true
                }
              ],
              "usage": {
                "completion_tokens": 3194,
                "completion_tokens_details": {
                  "reasoning_tokens": 2928
                },
                "prompt_tokens": 167,
                "prompt_tokens_details": {
                  "cached_tokens": 0
                },
                "total_tokens": 3361
              }
            },
            {
              "attempt": 2,
              "budget": {
                "legacy_max_tokens_as_visible": false,
                "max_completion_tokens": 12288,
                "reasoning_headroom_tokens": 8192,
                "visible_answer_tokens": 4096
              },
              "content": "```python\n# CODING_FIXTURE: apply_edits\ndef apply_edits(text, edits):\n    n = len(text)\n    edit_list = list(edits)\n\n    for edit in edit_list:\n        start, end, replacement = edit\n        if not isinstance(start, int) or not isinstance(end, int):\n            return None\n        if not isinstance(replacement, str):\n            return None\n        if start < 0 or end > n or start > end:\n            return None\n\n    for i in range(len(edit_list)):\n        for j in range(i + 1, len(edit_list)):\n            s1, e1, _ = edit_list[i]\n            s2, e2, _ = edit_list[j]\n            if s1 < e2 and s2 < e1:\n                return None\n\n    sorted_edits = sorted(edit_list, key=lambda e: e[0])\n    parts = []\n    prev_end = 0\n    for start, end, replacement in sorted_edits:\n        parts.append(text[prev_end:start])\n        parts.append(replacement)\n        prev_end = end\n    parts.append(text[prev_end:])\n    return ''.join(parts)\n```",
              "content_chars": 939,
              "content_excerpt": "```python\n# CODING_FIXTURE: apply_edits\ndef apply_edits(text, edits):\n    n = len(text)\n    edit_list = list(edits)\n\n    for edit in edit_list:\n        start, end, replacement = edit\n        if not is",
              "failure_class": null,
              "finish_reason": "stop",
              "latency_ms": 8156.6974999987,
              "reasoning_chars": 7744,
              "reasoning_excerpt": "The user wants me to write a Python function `apply_edits(text, edits)` with specific requirements:\n\n1. Fenced Python code block only, no prose\n2. No imports, no file access, no network, only builtins",
              "reasoning_field": "reasoning_content",
              "reasoning_tokens": 2166,
              "status": "passed",
              "text_checks": [
                {
                  "name": "marker",
                  "passed": true
                }
              ],
              "usage": {
                "completion_tokens": 2432,
                "completion_tokens_details": {
                  "reasoning_tokens": 2166
                },
                "prompt_tokens": 167,
                "prompt_tokens_details": {
                  "cached_tokens": 0
                },
                "total_tokens": 2599
              }
            },
            {
              "attempt": 3,
              "budget": {
                "legacy_max_tokens_as_visible": false,
                "max_completion_tokens": 12288,
                "reasoning_headroom_tokens": 8192,
                "visible_answer_tokens": 4096
              },
              "content": "```python\n# CODING_FIXTURE: apply_edits\ndef apply_edits(text, edits):\n    n = len(text)\n\n    for edit in edits:\n        if not isinstance(edit, tuple) or len(edit) != 3:\n            return None\n        start, end, replacement = edit\n        if not isinstance(start, int) or not isinstance(end, int):\n            return None\n        if not isinstance(replacement, str):\n            return None\n        if start < 0 or end > n:\n            return None\n        if start > end:\n            return None\n\n    sorted_edits = sorted(edits, key=lambda e: (e[0], e[1]))\n    for i in range(len(sorted_edits) - 1):\n        s1, e1, _ = sorted_edits[i]\n        s2, e2, _ = sorted_edits[i + 1]\n        if s1 < e2 and s2 < e1:\n            return None\n\n    parts = []\n    prev_end = 0\n    for start, end, replacement in sorted_edits:\n        parts.append(text[prev_end:start])\n        parts.append(replacement)\n        prev_end = end\n    parts.append(text[prev_end:])\n\n    return ''.join(parts)\n```",
              "content_chars": 981,
              "content_excerpt": "```python\n# CODING_FIXTURE: apply_edits\ndef apply_edits(text, edits):\n    n = len(text)\n\n    for edit in edits:\n        if not isinstance(edit, tuple) or len(edit) != 3:\n            return None\n      ",
              "failure_class": null,
              "finish_reason": "stop",
              "latency_ms": 9424.193799999557,
              "reasoning_chars": 8468,
              "reasoning_excerpt": "The user wants me to write a Python function `apply_edits(text, edits)` that:\n\n1. Takes a string `text` and a list of edits (each edit is a tuple `(start, end, replacement)`)\n2. Applies all edits atom",
              "reasoning_field": "reasoning_content",
              "reasoning_tokens": 2567,
              "status": "passed",
              "text_checks": [
                {
                  "name": "marker",
                  "passed": true
                }
              ],
              "usage": {
                "completion_tokens": 2851,
                "completion_tokens_details": {
                  "reasoning_tokens": 2567
                },
                "prompt_tokens": 167,
                "prompt_tokens_details": {
                  "cached_tokens": 0
                },
                "total_tokens": 3018
              }
            }
          ],
          "id": "apply_edits",
          "pass_count": 3,
          "pass_rate": 1.0,
          "required_pass_rate": 1.0,
          "status": "passed",
          "validator": "deterministic_text_checks"
        },
        {
          "attempt_count": 3,
          "attempts": [
            {
              "attempt": 1,
              "budget": {
                "legacy_max_tokens_as_visible": false,
                "max_completion_tokens": 12288,
                "reasoning_headroom_tokens": 8192,
                "visible_answer_tokens": 4096
              },
              "content": "```python\n# CODING_FIXTURE: normalize_posix_path\ndef normalize_posix_path(path):\n    if not isinstance(path, str):\n        return None\n    if not path.startswith('/'):\n        return None\n    parts = path.split('/')\n    stack = []\n    for part in parts:\n        if part == '' or part == '.':\n            continue\n        if part == '..':\n            if stack:\n                stack.pop()\n        else:\n            stack.append(part)\n    if not stack:\n        return '/'\n    return '/' + '/'.join(stack)\n```",
              "content_chars": 506,
              "content_excerpt": "```python\n# CODING_FIXTURE: normalize_posix_path\ndef normalize_posix_path(path):\n    if not isinstance(path, str):\n        return None\n    if not path.startswith('/'):\n        return None\n    parts = ",
              "failure_class": null,
              "finish_reason": "stop",
              "latency_ms": 2961.69430000009,
              "reasoning_chars": 2889,
              "reasoning_excerpt": "The user wants a single Python code block with a function `normalize_posix_path(path)` that:\n\n1. Takes a string POSIX absolute path beginning with `/`\n2. Returns canonical form:\n   - Collapse repeated",
              "reasoning_field": "reasoning_content",
              "reasoning_tokens": 824,
              "status": "passed",
              "text_checks": [
                {
                  "name": "marker",
                  "passed": true
                }
              ],
              "usage": {
                "completion_tokens": 954,
                "completion_tokens_details": {
                  "reasoning_tokens": 824
                },
                "prompt_tokens": 147,
                "prompt_tokens_details": {
                  "cached_tokens": 0
                },
                "total_tokens": 1101
              }
            },
            {
              "attempt": 2,
              "budget": {
                "legacy_max_tokens_as_visible": false,
                "max_completion_tokens": 12288,
                "reasoning_headroom_tokens": 8192,
                "visible_answer_tokens": 4096
              },
              "content": "```python\n# CODING_FIXTURE: normalize_posix_path\ndef normalize_posix_path(path):\n    if not isinstance(path, str):\n        return None\n    if not path.startswith('/'):\n        return None\n    parts = path.split('/')\n    stack = []\n    for part in parts:\n        if part == '' or part == '.':\n            continue\n        if part == '..':\n            if stack:\n                stack.pop()\n        else:\n            stack.append(part)\n    return '/' + '/'.join(stack)\n```",
              "content_chars": 469,
              "content_excerpt": "```python\n# CODING_FIXTURE: normalize_posix_path\ndef normalize_posix_path(path):\n    if not isinstance(path, str):\n        return None\n    if not path.startswith('/'):\n        return None\n    parts = ",
              "failure_class": null,
              "finish_reason": "stop",
              "latency_ms": 3086.999500001184,
              "reasoning_chars": 2773,
              "reasoning_excerpt": "The user wants me to write a Python function `normalize_posix_path(path)` that:\n1. Takes a string POSIX absolute path beginning with `/`\n2. Returns its canonical form:\n   - Collapse repeated slashes\n ",
              "reasoning_field": "reasoning_content",
              "reasoning_tokens": 850,
              "status": "passed",
              "text_checks": [
                {
                  "name": "marker",
                  "passed": true
                }
              ],
              "usage": {
                "completion_tokens": 970,
                "completion_tokens_details": {
                  "reasoning_tokens": 850
                },
                "prompt_tokens": 147,
                "prompt_tokens_details": {
                  "cached_tokens": 0
                },
                "total_tokens": 1117
              }
            },
            {
              "attempt": 3,
              "budget": {
                "legacy_max_tokens_as_visible": false,
                "max_completion_tokens": 12288,
                "reasoning_headroom_tokens": 8192,
                "visible_answer_tokens": 4096
              },
              "content": "```python\n# CODING_FIXTURE: normalize_posix_path\ndef normalize_posix_path(path):\n    if not isinstance(path, str):\n        return None\n    if not path.startswith('/'):\n        return None\n    parts = path.split('/')\n    stack = []\n    for part in parts:\n        if part == '' or part == '.':\n            continue\n        if part == '..':\n            if stack:\n                stack.pop()\n        else:\n            stack.append(part)\n    if not stack:\n        return '/'\n    return '/' + '/'.join(stack)\n```",
              "content_chars": 506,
              "content_excerpt": "```python\n# CODING_FIXTURE: normalize_posix_path\ndef normalize_posix_path(path):\n    if not isinstance(path, str):\n        return None\n    if not path.startswith('/'):\n        return None\n    parts = ",
              "failure_class": null,
              "finish_reason": "stop",
              "latency_ms": 2877.5495999998384,
              "reasoning_chars": 2753,
              "reasoning_excerpt": "The user wants a single fenced Python code block with no prose. Let me carefully design the function.\n\nRequirements:\n1. Define exactly `def normalize_posix_path(path):`\n2. `path` is a string POSIX abs",
              "reasoning_field": "reasoning_content",
              "reasoning_tokens": 816,
              "status": "passed",
              "text_checks": [
                {
                  "name": "marker",
                  "passed": true
                }
              ],
              "usage": {
                "completion_tokens": 946,
                "completion_tokens_details": {
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                },
                "prompt_tokens": 147,
                "prompt_tokens_details": {
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                },
                "total_tokens": 1093
              }
            }
          ],
          "id": "normalize_posix_path",
          "pass_count": 3,
          "pass_rate": 1.0,
          "required_pass_rate": 1.0,
          "status": "passed",
          "validator": "deterministic_text_checks"
        },
        {
          "attempt_count": 3,
          "attempts": [
            {
              "attempt": 1,
              "budget": {
                "legacy_max_tokens_as_visible": false,
                "max_completion_tokens": 12288,
                "reasoning_headroom_tokens": 8192,
                "visible_answer_tokens": 4096
              },
              "content": "```python\n# CODING_FIXTURE: lru_trace\n\ndef lru_trace(capacity, operations):\n    if not isinstance(capacity, int) or isinstance(capacity, bool) or capacity < 0:\n        return None\n    if not isinstance(operations, (list, tuple)):\n        return None\n\n    cache_dict = {}\n    order = []\n    results = []\n\n    for op in operations:\n        if not isinstance(op, tuple) or len(op) != 3:\n            return None\n\n        op_type = op[0]\n        key = op[1]\n        third = op[2]\n\n        if op_type == 'put':\n            if not isinstance(key, str) or not isinstance(third, str):\n                return None\n            if capacity == 0:\n                continue\n            if key in cache_dict:\n                order.remove(key)\n            else:\n                if len(cache_dict) >= capacity:\n                    lru_key = order[0]\n                    order.pop(0)\n                    del cache_dict[lru_key]\n            cache_dict[key] = third\n            order.append(key)\n        elif op_type == 'get':\n            if not isinstance(key, str) or third is not None:\n                return None\n            if key in cache_dict:\n                order.remove(key)\n                order.append(key)\n                results.append(cache_dict[key])\n            else:\n                results.append(None)\n        else:\n            return None\n\n    cache = [(k, cache_dict[k]) for k in order]\n    return (results, cache)\n```",
              "content_chars": 1419,
              "content_excerpt": "```python\n# CODING_FIXTURE: lru_trace\n\ndef lru_trace(capacity, operations):\n    if not isinstance(capacity, int) or isinstance(capacity, bool) or capacity < 0:\n        return None\n    if not isinstanc",
              "failure_class": null,
              "finish_reason": "stop",
              "latency_ms": 7596.725999999762,
              "reasoning_chars": 8031,
              "reasoning_excerpt": "Let me carefully analyze the requirements:\n\n1. Define `def lru_trace(capacity, operations):`\n2. `capacity` is a nonnegative integer\n3. Operations are three-item tuples: `('put', key, value)` or `('get",
              "reasoning_field": "reasoning_content",
              "reasoning_tokens": 2037,
              "status": "passed",
              "text_checks": [
                {
                  "name": "marker",
                  "passed": true
                }
              ],
              "usage": {
                "completion_tokens": 2383,
                "completion_tokens_details": {
                  "reasoning_tokens": 2037
                },
                "prompt_tokens": 210,
                "prompt_tokens_details": {
                  "cached_tokens": 0
                },
                "total_tokens": 2593
              }
            },
            {
              "attempt": 2,
              "budget": {
                "legacy_max_tokens_as_visible": false,
                "max_completion_tokens": 12288,
                "reasoning_headroom_tokens": 8192,
                "visible_answer_tokens": 4096
              },
              "content": "```python\n# CODING_FIXTURE: lru_trace\ndef lru_trace(capacity, operations):\n    if not isinstance(capacity, int) or isinstance(capacity, bool) or capacity < 0:\n        return None\n    if not isinstance(operations, (list, tuple)):\n        return None\n    for op in operations:\n        if not isinstance(op, tuple) or len(op) != 3:\n            return None\n        if op[0] == 'put':\n            if not isinstance(op[1], str) or not isinstance(op[2], str):\n                return None\n        elif op[0] == 'get':\n            if not isinstance(op[1], str) or op[2] is not None:\n                return None\n        else:\n            return None\n\n    cache = {}\n    order = []\n    results = []\n\n    for op in operations:\n        if op[0] == 'get':\n            key = op[1]\n            if key in cache:\n                results.append(cache[key])\n                order.remove(key)\n                order.append(key)\n            else:\n                results.append(None)\n        else:\n            key = op[1]\n            value = op[2]\n            if capacity == 0:\n                continue\n            if key in cache:\n                cache[key] = value\n                order.remove(key)\n                order.append(key)\n            else:\n                if len(order) >= capacity:\n                    evict_key = order.pop(0)\n                    del cache[evict_key]\n                cache[key] = value\n                order.append(key)\n\n    cache_list = [(k, cache[k]) for k in order]\n    return (results, cache_list)\n```",
              "content_chars": 1513,
              "content_excerpt": "```python\n# CODING_FIXTURE: lru_trace\ndef lru_trace(capacity, operations):\n    if not isinstance(capacity, int) or isinstance(capacity, bool) or capacity < 0:\n        return None\n    if not isinstance",
              "failure_class": null,
              "finish_reason": "stop",
              "latency_ms": 7664.449500000046,
              "reasoning_chars": 8611,
              "reasoning_excerpt": "The user wants me to write a Python function `lru_trace(capacity, operations)` that implements an LRU cache and returns specific results.\n\nLet me analyze the requirements:\n1. Define exactly `def lru_t",
              "reasoning_field": "reasoning_content",
              "reasoning_tokens": 2138,
              "status": "passed",
              "text_checks": [
                {
                  "name": "marker",
                  "passed": true
                }
              ],
              "usage": {
                "completion_tokens": 2519,
                "completion_tokens_details": {
                  "reasoning_tokens": 2138
                },
                "prompt_tokens": 210,
                "prompt_tokens_details": {
                  "cached_tokens": 0
                },
                "total_tokens": 2729
              }
            },
            {
              "attempt": 3,
              "budget": {
                "legacy_max_tokens_as_visible": false,
                "max_completion_tokens": 12288,
                "reasoning_headroom_tokens": 8192,
                "visible_answer_tokens": 4096
              },
              "content": "```python\n# CODING_FIXTURE: lru_trace\ndef lru_trace(capacity, operations):\n    if not isinstance(capacity, int) or isinstance(capacity, bool) or capacity < 0:\n        return None\n    if not isinstance(operations, (list, tuple)):\n        return None\n    for op in operations:\n        if not isinstance(op, tuple) or len(op) != 3:\n            return None\n        if op[0] == 'put':\n            if not isinstance(op[1], str) or not isinstance(op[2], str):\n                return None\n        elif op[0] == 'get':\n            if not isinstance(op[1], str) or op[2] is not None:\n                return None\n        else:\n            return None\n    cache = {}\n    order = []\n    results = []\n    for op in operations:\n        if op[0] == 'put':\n            key, value = op[1], op[2]\n            if key in cache:\n                cache[key] = value\n                order.remove(key)\n            else:\n                cache[key] = value\n            order.append(key)\n            if len(order) > capacity:\n                evict_key = order.pop(0)\n                del cache[evict_key]\n        elif op[0] == 'get':\n            key = op[1]\n            if key in cache:\n                results.append(cache[key])\n                order.remove(key)\n                order.append(key)\n            else:\n                results.append(None)\n    final_cache = [(k, cache[k]) for k in order]\n    return (results, final_cache)\n```",
              "content_chars": 1409,
              "content_excerpt": "```python\n# CODING_FIXTURE: lru_trace\ndef lru_trace(capacity, operations):\n    if not isinstance(capacity, int) or isinstance(capacity, bool) or capacity < 0:\n        return None\n    if not isinstance",
              "failure_class": null,
              "finish_reason": "stop",
              "latency_ms": 6612.221600000339,
              "reasoning_chars": 6485,
              "reasoning_excerpt": "The user wants me to write a single fenced Python code block with no prose outside it. Let me carefully implement the `lru_trace` function.\n\nRequirements:\n1. Define exactly `def lru_trace(capacity, op",
              "reasoning_field": "reasoning_content",
              "reasoning_tokens": 1638,
              "status": "passed",
              "text_checks": [
                {
                  "name": "marker",
                  "passed": true
                }
              ],
              "usage": {
                "completion_tokens": 2007,
                "completion_tokens_details": {
                  "reasoning_tokens": 1638
                },
                "prompt_tokens": 210,
                "prompt_tokens_details": {
                  "cached_tokens": 0
                },
                "total_tokens": 2217
              }
            }
          ],
          "id": "lru_trace",
          "pass_count": 3,
          "pass_rate": 1.0,
          "required_pass_rate": 1.0,
          "status": "passed",
          "validator": "deterministic_text_checks"
        },
        {
          "attempt_count": 3,
          "attempts": [
            {
              "attempt": 1,
              "budget": {
                "legacy_max_tokens_as_visible": false,
                "max_completion_tokens": 12288,
                "reasoning_headroom_tokens": 8192,
                "visible_answer_tokens": 4096
              },
              "content": "```python\n# CODING_FIXTURE: decode_uvarint\ndef decode_uvarint(data):\n    if not data:\n        return None\n    value = 0\n    shift = 0\n    i = 0\n    while True:\n        if i >= 10:\n            return None\n        if i >= len(data):\n            return None\n        b = data[i]\n        if not isinstance(b, int) or b < 0 or b > 255:\n            return None\n        value |= (b & 0x7F) << shift\n        i += 1\n        if not (b & 0x80):\n            break\n        shift += 7\n    if i > 1 and (data[i - 1] & 0x7F) == 0:\n        return None\n    if value > (1 << 64) - 1:\n        return None\n    return (value, i)\n```",
              "content_chars": 609,
              "content_excerpt": "```python\n# CODING_FIXTURE: decode_uvarint\ndef decode_uvarint(data):\n    if not data:\n        return None\n    value = 0\n    shift = 0\n    i = 0\n    while True:\n        if i >= 10:\n            return N",
              "failure_class": null,
              "finish_reason": "stop",
              "latency_ms": 20610.423600001013,
              "reasoning_chars": 15772,
              "reasoning_excerpt": "The user wants a Python function `decode_uvarint(data)` that decodes a canonical unsigned LEB128 value from a list of integer bytes.\n\nRequirements:\n1. Only one fenced Python code block, no prose\n2. No",
              "reasoning_field": "reasoning_content",
              "reasoning_tokens": 6073,
              "status": "passed",
              "text_checks": [
                {
                  "name": "marker",
                  "passed": true
                }
              ],
              "usage": {
                "completion_tokens": 6290,
                "completion_tokens_details": {
                  "reasoning_tokens": 6073
                },
                "prompt_tokens": 172,
                "prompt_tokens_details": {
                  "cached_tokens": 0
                },
                "total_tokens": 6462
              }
            },
            {
              "attempt": 2,
              "budget": {
                "legacy_max_tokens_as_visible": false,
                "max_completion_tokens": 12288,
                "reasoning_headroom_tokens": 8192,
                "visible_answer_tokens": 4096
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