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{"type":"assistant_message","payload":{"text":"I read this as a read-only Gate20 root-cause investigation - I’ll inspect the sealed evidence and code, reproduce the failing node across successor/predecessor and controlled delta variants, then report exact evidence and the smallest repair without changing the repository or evidence."}}
{"type":"tool_execution","payload":{"tool":"bash","is_error":true}}
{"type":"tool_execution","payload":{"tool":"bash","is_error":true}}
{"type":"tool_execution","payload":{"tool":"bash","is_error":true}}
{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
{"type":"tool_execution","payload":{"tool":"read","is_error":false}}
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{"type":"assistant_message","payload":{"text":"The primary Gate20 artifact mixed an interpreter dependency collection failure with a later corrected run; I’m separating those harness layers now and using the candidate’s sealed snapshot plus the corrected JUnit to test candidate causality rather than trusting the receipt’s initial attribution."}}
{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
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{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
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{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
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{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
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{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
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{"type":"assistant_message","payload":{"text":"Candidate causality is now disproved: successor and predecessor fail identically under the certification launcher’s `umask 077`, while both pass under the interactive `0022` umask because the security seam rejects the fixture’s `0644` file before the injected replacement runs. I’m doing one final production-level inode trace to pin the correct assertion and repair."}}
{"type":"tool_execution","payload":{"tool":"bash","is_error":false}}
{"type":"assistant_message","payload":{"text":"I read this as a read-only Gate20 root-cause investigation - I inspected the evidence, reproduced both sealed variants, and isolated the harness-dependent test defect.\n\n## Verdict\n\nThis is **not candidate-caused**. The failure is a pre-existing test defect exposed by the certification harness’s `umask 077`.\n\nThe test injects:\n\n```python\nos.replace(replacement, path)\n```\n\nProduction correctly detects the inode replacement and raises:\n\n```text\nValueError: overlay journal file was replaced\n```\n\nBut the test then incorrectly expects `path` still to name the original inode. POSIX `os.replace` guarantees that `path` names the replacement inode. The original inode remains unchanged but unlinked.\n\n## Evidence chain\n\nThe primary Gate20 JUnit did not contain this failure. It contained three collection errors because the Hermes interpreter lacked `typer`.\n\nThe first corrected run executed zero tests because:\n\n```text\nERROR: Unknown config option: asyncio_default_fixture_loop_scope\n```\n\nThe authoritative failure is:\n\n```text\n...-gate20-corrected-v2-st_01a00b39/artifacts/corrected-source-package.junit.xml\n```\n\nIt reports 679 tests, 3 failures, including:\n\n```text\ntests.test_adaptive_nutrition\ntest_overlay_recovery_rejects_symlink_and_data_inode_replacement\n\nassert b'replacement' == complete + b'{\"torn\":'\n```\n\nThe production seam is `OverlayJournal._recover_locked`, particularly lines 7273-7282 of `adaptive_nutrition.py`, which compares the post-read named inode against the inode returned by `_read_overlay_rows_locked`.\n\n## Hypotheses tested\n\n1. **Candidate delta changed overlay behavior — refuted.**\n   - The only successor files are:\n     - `checkin_cli/customer_admin.py`\n     - `checkin_cli/activation_token_rotation_policy.py`\n     - `tests/test_customer_admin.py`\n   - `adaptive_nutrition.py` matches the sealed snapshot at SHA-256 `d3020f...342bcb`.\n   - Rebinding all three files to predecessor state gives the identical failure.\n\n2. **Test order/global leakage — order refuted, inherited global state confirmed.**\n   - The test fails alone and after its two preceding overlay tests under `umask 077`.\n   - It passes alone and in order under `umask 0022`.\n   - This is not leakage from another test. Both certification scripts explicitly execute `umask 077`.\n\n3. **Harness/filesystem semantics — confirmed root cause.**\n   - Under `0022`, `Path.write_bytes()` creates mode `0644`; production rejects the unsafe fixture before the monkeypatched `os.replace` executes, producing a false pass.\n   - Under `0077`, files are mode `0600`, so the replacement executes. Production detects it, but the test’s final pathname assertion is invalid.\n\n## Exact controlled results\n\nSuccessor alone, isolated bwrap, inherited `0022`:\n\n```text\n1 passed in 0.09s\nEXIT=0\n```\n\nSuccessor after preceding overlay tests, `0022`:\n\n```text\n3 passed in 0.10s\nEXIT=0\n```\n\nPredecessor three-file rebind, alone and ordered, `0022`:\n\n```text\n1 passed in 0.09s\n3 passed in 0.09s\n```\n\nThe same four commands prefixed with `umask 077`:\n\n```text\nsuccessor alone:       1 failed in 0.12s, EXIT=1\nsuccessor ordered:     1 failed, 2 passed in 0.12s, EXIT=1\npredecessor alone:     1 failed in 0.13s, EXIT=1\npredecessor ordered:   1 failed, 2 passed in 0.12s, EXIT=1\n```\n\nRepresentative command:\n\n```bash\numask 077\nbwrap --die-with-parent --unshare-net --ro-bind / / \\\n  --tmpfs /tmp --dev /dev --proc /proc \\\n  --setenv HOME /tmp --setenv TMPDIR /tmp \\\n  --setenv PYTHONDONTWRITEBYTECODE 1 \\\n  --setenv PYTHONPATH \"$S\" --chdir \"$S\" \\\n  /home/cube/miniconda3/bin/python -B -m pytest -q \\\n  -p no:cacheprovider \\\n  tests/test_adaptive_nutrition.py::test_overlay_recovery_rejects_symlink_and_data_inode_replacement\n```\n\nThe predecessor command additionally read-only bound the two predecessor files and `/dev/null` over the added module.\n\nProduction-level inode trace under `umask 077`:\n\n```text\nrecover_exception ValueError overlay journal file was replaced\nheld_mode 0o600\nheld_identity (84, 8)\nnamed_identity (84, 9)\nnamed_bytes b'replacement'\noriginal_inode_bytes_unchanged True\nEXIT=0\n```\n\n## Smallest test-first repair\n\nFix the test, not production or the harness:\n\n1. Explicitly `chmod(0o600)` both manually created files so the security path is exercised regardless of launcher umask.\n2. After recovery rejects the replacement, assert:\n   - the named path contains `b\"replacement\"`;\n   - optionally, through a descriptor opened before replacement, the original inode still contains `complete + b'{\"torn\":'`.\n\nConceptually:\n\n```python\npath.write_bytes(complete + b'{\"torn\":')\npath.chmod(0o600)\nreplacement.write_bytes(b\"replacement\")\nreplacement.chmod(0o600)\n\noriginal_fd = os.open(path, os.O_RDONLY)\ntry:\n    with pytest.raises(ValueError, match=\"unsafe|replaced\"):\n        journal.recover()\n\n    assert path.read_bytes() == b\"replacement\"\n    os.lseek(original_fd, 0, os.SEEK_SET)\n    assert os.read(original_fd, len(complete) + 8) == complete + b'{\"torn\":'\nfinally:\n    os.close(original_fd)\n```\n\nDo not “correct” the harness by changing its umask: that would restore a false-positive pass without testing inode replacement.\n\nNo repository, candidate, evidence, Git, service, or live-state files were changed."}}
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