fix(test): give the dispatcher suite a project root that exists

[drussell23]

project_root was hardcoded to Path("/tmp/test-project-6b") — a directory nothing creates. Every op failed GENERATE with target_file_missing: backend/core/utils.py and never reached the GATE / APPROVE / APPLY terminals these tests assert on.

It went unnoticed because the CancelToken fake (fixed in #70215) short-circuited each op to POSTMORTEM before GENERATE ran. One dead fake concealing another — repairing the first is what made this visible.

The fix

Materialised per-test from tmp_path, with the target file actually written:

• Real parseable content, since VALIDATE runs an AST pass — an empty placeholder would only trade target_file_missing for a SyntaxError.
• tmp_path rather than a fixed directory, because a shared /tmp path is order-dependent state between sessions, and this repo's node policy makes /tmp unwritable outright.
• One constant instead of two literals that had to agree with a third value (the root) for the suite to work at all. A disagreement between them is not diagnosable by reading any one of them.

Status — still 9 red

test_artifact_generation_threads_classify_to_validate now passes and the failure set shifted, which is the signal that this was a real cause rather than a reshuffle.

The next one down is the same defect class again: test_gate_can_write_denied_terminal now reaches COMPLETE instead of CANCELLED, with dispatcher-off/on parity intact. Both paths agree, so the gate is not consulting stack.can_write at all — that fake is likely modelling a seam production no longer reads. canary_not_promoted is produced in governance/integration.py:480, which is where the next trace should start.

🤖 Generated with Claude Code

---

Summary by cubic

Fix dispatcher tests by using a real, per-test project root and target file instead of a hardcoded /tmp path. This lets ops pass GENERATE and reach the expected GATE/APPROVE/APPLY terminals.

• Bug Fixes
  • Added an autouse fixture that sets _FIXTURE_ROOT to tmp_path and creates backend/core/utils.py with parseable content.
  • Replaced duplicated path literals with a _TARGET_REL constant and updated the generator, target_files, and config to use it.
  • Config now reads project_root from _FIXTURE_ROOT (not Path('/tmp/test-project-6b')), removing /tmp state and unwritable-node issues; failure set shifted and at least one test now passes.

^{Written for commit 5bea6cb. Summary will update on new commits.}

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📊 PR Size Analysis

Size: XS
Files Changed: 1
Lines Added: +45
Lines Deleted: -3
Total Changes: 48

Review Checklist

• All tests passing
• Code follows project style guidelines
• Documentation updated if needed
• No sensitive data exposed
• Breaking changes documented

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🤖 CI/CD Pipeline Results

Status: success
Branch: 70216/merge
Commit: 7dd2c80f63c72a6cfdde93483131c088e4798291

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