Add exec-harness false-green fixture for contradictory GREEN/0 inspection proof

[cbusillo]

Summary

Add and preserve a Code exec-harness regression fixture that proves contradictory JetBrains inspection GREEN/0 evidence is classified as UNKNOWN, not accepted as clean/readiness proof.

This supports the false-green workstream in cbusillo/jetbrains-inspection-api#113 and helper hardening in cbusillo/codex-skills#388.

Current Status

A local scenario has been added and run successfully in code-prealign-new-skills:

python3 tools/code-exec-harness/harness.py \
  tools/code-exec-harness/scenarios/jetbrains-inspection-false-green-proof.json \
  --inherit-auth

Passing evidence:

failures: []
run_dir: .tmp/code-exec-harness/20260620-153934-jetbrains-inspection-false-green-proof

The scenario uses a fake jetbrains-inspection-proof skill/helper that returns a tempting top-level GREEN and total_problems: 0, while proof fields show:

• wrong resolved project path
• empty changed_files scope
• wrong profile
• missing Odoo inspection IDs

The expected Code behavior is UNKNOWN / not ready.

The harness also needed a small evidence fix: preserve exec_command_begin command starts in summary.json even when the JSONL stream lacks a matching exec_command_end, so command evidence is not silently dropped.

Token-Bloat Boundary

This fixture should assert compact machine evidence and final classification. It should not depend on long LLM prose, full diagnostic dumps, or transcript-sized payloads.

Acceptance Criteria

• Scenario jetbrains-inspection-false-green-proof.json is present and runnable.
• Fake proof skill/helper emits contradictory GREEN/0 evidence with compact proof fields.
• Harness run fails if Code reports the worktree as ready/clean/proven green.
• Harness run passes when Code reports UNKNOWN / not ready and cites compact proof failures.
• summary.json preserves helper command evidence even if a command start lacks a final command-end event.
• The fixture references WebStorm red-lane proof fails to confirm RED and exposes false-green route risk jetbrains-inspection-api#113, Define compact inspection proof evidence contract for agent-facing verdicts jetbrains-inspection-api#114, and Harden JetBrains inspection skill against false-green route and session states codex-skills#388.

Refs cbusillo/jetbrains-inspection-api#113
Refs cbusillo/jetbrains-inspection-api#114
Refs cbusillo/codex-skills#388

[cbusillo]

Destination correction: cbusillo/code is retired. The durable destination for this harness work is now cbusillo/codex-lab.

Use this issue as historical/staging context only. The replacement tracking issue is:

• Import exec-harness false-green fixture from code-prealign-new-skills codex-lab#155

The source work remains in local staging at:

/Users/cbusillo/Developer/code-prealign-new-skills