Add diagnostic logging to qmd_index.cjs for empty index debugging

[Copilot]

The qmd index silently produced 0 indexed files with no actionable output to diagnose why — resolved paths, pattern values, and collection registration were all invisible.

Changes

• Per-checkout diagnostics: logs raw path, resolved path (after ${ENV_VAR} expansion), and whether the resolved path exists on disk — immediately surfaces ${GITHUB_WORKSPACE} expansion failures or missing checkouts
• Collection summary before indexing: logs each registered collection (name, path, pattern) before calling createStore — exposes malformed comma-joined patterns like docs/src/content/docs/**,.github/agents/**,.github/aw/**
• Zero-file warning: emits core.warning with actionable hints when store.update() returns 0 files, covering the known failure modes: missing path, dotfile glob exclusion, unsupported comma-separated patterns, unresolved env vars

Example output on a misconfigured run:

Collection "gh-aw": path="${GITHUB_WORKSPACE}" -> "/home/runner/work/gh-aw/gh-aw" pattern="docs/src/content/docs/**,.github/agents/**,.github/aw/**"
Collection "gh-aw": path exists
Registering 1 collection(s): gh-aw
  [gh-aw] path="/home/runner/work/gh-aw/gh-aw" pattern="docs/src/content/docs/**,.github/agents/**,.github/aw/**"
Update complete: 0 indexed, 0 updated, 0 unchanged, 0 removed
Warning: No files were indexed. Possible causes:
  - The glob patterns do not match any files (check for dotfile exclusions in patterns starting with '.')
  - The pattern uses a comma-separated list that the qmd SDK does not support
  ...

[Copilot]

Pull request overview

Adds diagnostic logging to the qmd indexing action so misconfigured checkout paths and glob patterns are visible, and emits an actionable warning when indexing results in zero files.

Changes:

• Log per-checkout raw vs resolved paths, plus an existence check on the resolved path.
• Log a summary of registered collections (name/path/pattern) before creating the qmd store.
• Warn via core.warning when store.update() results in zero indexed/updated/unchanged files.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
actions/setup/js/qmd_index.cjs	Adds collection diagnostics (paths/patterns/existence), collection registration summary, and a zero-file warning after update.
.github/workflows/test-dispatcher.lock.yml	Updates the aw_context input description in generated Safe Outputs tool metadata.

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[Copilot]

The collection summary log uses col.pattern || "(default)", which will report "(default)" when col.pattern is the empty string (e.g., when checkout.patterns is an empty array and patterns.join(",") yields ""). That’s misleading for debugging and hides an actual misconfiguration (an empty pattern typically matches nothing). Consider logging the actual value (even if empty) and/or normalizing empty patterns back to the default (e.g., treat [] or "" as "**/*.md").

Suggested change

	core.info(` [${name}] path="${col.path}" pattern="${col.pattern || "(default)"}"`);
	const patternForLog = col.pattern === undefined ? "(default)" : col.pattern;
	core.info(` [${name}] path="${col.path}" pattern="${patternForLog}"`);