test(lab): close CL-02 hardening gate

[Wibias]

Summary

Closes the remaining CL-02 post-merge acceptance bookkeeping after #1343 merged.

• strengthens the purge tombstone regression to assert the exact empty_purge_targets validation code
• adds an explicit CL-02 closure-gate record
• remains CL-02-only; no CL-03 runtime work and no frozen CL-00 semantic changes

Base

• base: current dev
• starting SHA: f197529c7d8c6adbaf3f859547414698d349340d
• contains fix(lab): CL-02 post-merge hardening #1343 merge eee2dab4d1bbacefce56057adad51d734f346702

Gate

CL-03 remains blocked until this PR has green required CI, no unresolved valid CodeRabbit findings, and is merged to dev.

Summary by CodeRabbit

• Bug Fixes

  • Improved validation coverage for purge operations by verifying the specific error code returned when no purge targets are provided.

• Documentation

  • Updated compatibility-lab status and closure records with post-merge acceptance details, validation coverage, merge information, and CI review requirements.
  • Documented the conditions required before the next compatibility-lab phase can proceed.

[github-actions]

✅ Deterministic PR hygiene checks passed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: b0277a57-31d8-400d-aace-465b1e1100f4

📥 Commits

Reviewing files that changed from the base of the PR and between f197529 and 84941ad.

📒 Files selected for processing (3)

• devlog/_plan/260807_compatibility_lab/001_pr_stack_status.md
• devlog/_plan/260807_compatibility_lab/053_cl02_closure_gate.md
• tests/lab-post-merge-hardening.test.ts

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📝 Walkthrough

Walkthrough

The PR hardens empty purge-tombstone validation and records CL-02 closure evidence. CL-03 authorization now requires green CI, no unresolved valid findings, and merge to dev.

Changes

CL-02 closure and CL-03 authorization

Layer / File(s)	Summary
Purge validation assertion tests/lab-post-merge-hardening.test.ts:291-307	The test catches LabValidationError and asserts the empty_purge_targets error code.
Closure and authorization records devlog/_plan/260807_compatibility_lab/053_cl02_closure_gate.md:1-15, devlog/_plan/260807_compatibility_lab/001_pr_stack_status.md:24-25, devlog/_plan/260807_compatibility_lab/001_pr_stack_status.md:130-159	The plans record CL-02 merge, hardening, CI, and closure details. CL-03 requires PR #1348 to have green CI, no unresolved valid CodeRabbit findings, and a merge to dev.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• lidge-jun/opencodex#1286: Updates the same compatibility-lab stack-status and CL-02 acceptance bookkeeping.
• lidge-jun/opencodex#1333: Precedes the CL-02 hardening and closure changes.
• lidge-jun/opencodex#1343: Precedes the purge-tombstone validation and CL-02 closure updates.

Suggested reviewers: ingwannu, lidge-jun

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the lab test scope and the primary change: closing the CL-02 hardening gate.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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