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    {
      "check": "operation",
      "status": "PASS",
      "details": {
        "working": true,
        "argv": [
          "examples/meeting.py"
        ],
        "kind": "cli",
        "returncode": 0,
        "stdout": "start=8 end=9 duration=1\n[Meeting(start=8, end=9, duration=1), Meeting(start=8, end=10, duration=2), Meeting(start=8, end=11, duration=3), Meeting(start=8, end=12, duration=4), Meeting(start=9, end=10, duration=1)]\n{'model': 'Meeting', 'mode': 'strict', 'fields': {'start': {'type': 'int', 'choices': None, 'default': 'generated'}, 'end': {'type': 'int', 'choices': None, 'default': 'generated'}, 'duration': {'type': 'int', 'choices': None, 'default': 'generated'}}, 'validators': [{'name': 'check', 'status': 'modeled', 'detail': 'pure rejection validator'}], 'unsupported': [], 'validator_constraints_active': True, 'can_prove_unsat': True, 'unsat_requires_explicit_fields': [], 'max_attempts': 100, 'work_limit_per_check': 1000000, 'timeout_ms_per_check': 1000}\nProven impossible: Meeting: start=17, duration=4 conflict with end <= 18, Meeting.check (line 15)",
        "stderr": "",
        "needs_credentials": false,
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  "steps": [
    "cd <host-path> && ls -la && cat README.md 2>/dev/null | head -200",
    "echo CDP=$CDP_URL $<env-var>; node -v; npm -v; python3 --version; ls <host-path>",
    "cd <host-path> && grep -n -i -E '^#+ |uv |mcp|cli|modelfill ' README.md | sed -n '1,200p'; ls examples tests .github/workflows; cat pyproject.toml | head -60; which uv pip3 pip",
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    "sudo apt-get update -qq && sudo DEBIAN_FRONTEND=noninteractive apt-get install -y -qq python3-venv >/dev/null 2>&1; cd /tmp && rm -rf /tmp/uvtool && python3 -m venv /tmp/uvtool && /tmp/uvtool/bin/pip install -q uv && sudo ln -sf /tmp/uvtool/bin/uv /usr/local/bin/uv && uv --version",
    "cd <host-path> && export NODE_USE_ENV_PROXY=1 && uv sync 2>&1 | tail -15",
    "cd <host-path> && uv run python examples/meeting.py; echo \"rc=$?\"; cat examples/meeting.py | head -40",
    "cd <host-path> && mkdir -p .coldpass && ls -la .coldpass && cat > .coldpass/probe.json <<'EOF'\n{\"kind\":\"cli\",\"argv\":[\"<host-path>\",\"examples/meeting.py\"],\"cwd\":\"<host-path>\",\"expected_text\":\"Proven impossible\"}\nEOF\ncat > .coldpass/report.json <<'EOF'\n{\"outcome\":\"working\",\"operation\":\"Ran the README example `uv run python examples/meeting.py` (modelfill Meeting model): fill() solves backwards, batch(), explain(), and proves an impossible input unsatisfiable.\",\"operation_scope\":\"Core library only; no external services, credentials or browser needed. Hypothesis extra and full test/lint suites intentionally not run.\",\"steps\":[\"Read README.md (Install, Quickstart, Development sections)\",\"Installed uv 0.13.1 via a venv at /tmp/uvtool, symlinked to /usr/local/bin/uv\",\"uv sync in <host-path> (installed modelfill 0.4.0, pydantic 2.14.1, z3-solver 4.16.0.0)\",\"uv run python examples/meeting.py (exit 0, printed 'Proven impossible: ...')\"],\"deviations\":[\"README does not list uv installation; guest lacked uv and python3-venv, so installed python3-venv via apt and uv via pip into /tmp/uvtool.\"],\"stuck_step\":null,\"main_blocker\":null,\"suggested_fix\":null}\nEOF\n<env-var>=<host-path> python3 -I <host-path> --validate"
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  "profile": {
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    "reasoning": "low"
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  "date": "2026-10-18T18:40:00.718850+00:00",
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  "recovery": {
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    "original_run_id": "jplauri--modelfill-claude-haiku-5-5-1792348722843982271",
    "historical": true,
    "ledger_sha256": "c5e6a833c182c1e2aecf69d0bd0020aec63c65d98f3e933e4b32232340312736"
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  "transcript_url": "/transcripts/jplauri--modelfill-claude-haiku-5-5-1792348722843982271.txt",
  "report_url": "/reports/jplauri--modelfill-claude-haiku-5-5-1792348722843982271.json"
}