fix(adapter): explain non-recursive artifact scan

[ahcrm-core]

What

Make the unpinned result-artifact failure breadcrumb state that the configured artifact directories are searched directly and subdirectories are not searched.

Why

A completed story spec stored one level below implementation-artifacts currently produces an opaque no-artifact result. Naming the scan boundary makes the failure actionable without broadening the scan and weakening the existing session-ownership safeguards.

Closes #780

How

• Add a focused regression test with a completed result spec under implementation-artifacts/stories/.
• Preserve the existing non-recursive scan and expected_spec / proof-of-work boundaries.
• Expand the no-artifact breadcrumb with the exact scan limitation.

Testing

• Red phase: the new focused test failed before the implementation change.
• uv run pytest -q tests/test_generic_tmux.py: 260 passed, 8 skipped.
• uv run pyright: 0 errors, 0 warnings.
• uv run ruff format --check ... and uv run ruff check ...: passed.
• Full suite in the restricted environment: 10,545 passed, 169 skipped, 27 failed. Twenty-six failures were isolated to the ambient SOCKS proxy; tests/test_opencode_http.py passed 121/121 with proxy variables removed for that run. The remaining socket-entry test is blocked by the environment's PermissionError: [Errno 1] Operation not permitted. None touches the changed path.

Changelog

Added a Fixed entry under ## [Unreleased].

Summary by CodeRabbit

• Bug Fixes

  • Unpinned result-artifact scans now check only the configured artifact directories, excluding nested subdirectories.
  • Diagnostic breadcrumbs now clearly distinguish direct file lookups from directory scans and explain when subdirectories are not searched.
  • Updated messages identify the exact path for single-file lookups and clarify when no qualifying artifact is found.

• Documentation

  • Added an Unreleased changelog entry describing the corrected artifact-scan behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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• src/bmad_loop/adapters/generic.py
• tests/test_generic_tmux.py

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Walkthrough

The change clarifies no-artifact diagnostics for non-recursive scans. Tests verify nested artifacts remain excluded, directory scans name the searched directory, and pinned lookups use at: formatting. The changelog records the fix.

Changes

Artifact scan diagnostics

Layer / File(s)	Summary
Diagnostic message and regression coverage src/bmad_loop/adapters/generic.py, tests/test_generic_tmux.py, CHANGELOG.md	The no-artifact breadcrumb now distinguishes pinned-path lookups from directory scans. Directory scans identify the configured directory and state that subdirectories are not searched. Tests cover both formats and nested artifacts. The changelog documents the behavior.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~4 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: pbean

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: explaining the adapter's non-recursive artifact scan.
Linked Issues check	✅ Passed	Issue #780 requires an actionable no-artifact breadcrumb and preservation of the non-recursive artifact scan. The implementation reports the configured directory and states that subdirectories are n…
Out of Scope Changes check	✅ Passed	The implementation change, regression tests, and Unreleased changelog entry support Issue #780. The pinned-path wording change preserves the separate expected_spec behavior. No unrelated behavior ch…

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_{A rabbit found the breadcrumb clear
The searched path now shines near
Nested tales stay out of sight
Pinned paths point exactly right
Flat scans tell what they do
And changelog notes it too}

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@src/bmad_loop/adapters/generic.py`:
- Around line 1853-1855: Update the no-result message in _frontmatter_fallback
to use file-specific wording when only is set, stating that no artifact was
found at the authoritative file path; retain the existing non-recursive
directory wording when only is None.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 3bd2c7e1-cb1e-4c7a-8688-d26574145fa2

📥 Commits

Reviewing files that changed from the base of the PR and between b755a0f and b267a85.

📒 Files selected for processing (3)

• CHANGELOG.md
• src/bmad_loop/adapters/generic.py
• tests/test_generic_tmux.py

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.