fix(compat): slash-free grep/glob filters match by basename at any depth (#178)

[OGtwelve]

Closes #178. XS P1 batch from the parity verification (#196).

Problem

globToRegExp anchored every pattern to the whole relative path (^…$), so a slash-free filter like glob: '*.ts' compiled to ^[^/]*\.ts$ and matched root-level files only — every nested file was silently dropped. ripgrep (the semantics this tool advertises) matches slash-free globs against the basename at any depth, and that is the shape models emit most often. Probe-verified: {pattern:'needle', glob:'*.ts'} over root.ts + src/nested.ts returned only root.ts.

Fix

A pattern with no / is prefixed with (?:^|.*/) (the same unanchored form gitignore.ts already uses), so *.ts matches root.ts AND src/nested.ts. A pattern containing / (src/*.ts, **/*.ts) keeps full-path anchoring — * still never crosses a directory boundary. Shared globToRegExp → grep and glob stay consistent. The grep glob field now documents the behavior.

Tests

• slash-free matches nested (grep + glob tool), slashed stays anchored, the prior root-only assertion corrected to the ripgrep behavior.
• Green: typecheck (both) + test:node (compat 255) + biome.

Part of #196.

Summary by CodeRabbit

• New Features

  • Improved file search and filtering with slash-free patterns such as *.ts, which now match files in nested directories.
  • Preserved full-path matching for patterns containing slashes, such as src/*.ts.
  • Added clearer guidance for glob pattern behavior, including alternation support.

• Bug Fixes

  • Corrected grep and file-listing results for nested files filtered by filename patterns.

[coderabbitai]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 8221395 and ae0db2e.

📒 Files selected for processing (2)

• packages/ai-claude-compat/src/search-tools.test.ts
• packages/ai-claude-compat/src/search-tools.ts

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📝 Walkthrough

Walkthrough

The search tools now match slash-free globs against basenames at any directory depth, while slash-containing globs remain anchored to relative paths. The glob schema documents these semantics, and tests cover both globTool and grepTool.

Changes

Glob matching semantics

Layer / File(s)	Summary
Update glob matching behavior packages/ai-claude-compat/src/search-tools.ts	The glob schema describes slash-sensitive matching, and globToRegExp applies root-or-any-depth matching to slash-free patterns while preserving full-path anchoring for patterns containing /.
Validate glob and grep results packages/ai-claude-compat/src/search-tools.test.ts	Tests verify nested basename matches, slash-containing path anchoring, and .ts filtering for both search tools.

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

🚥 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 summarizes the main change: slash-free grep/glob filters matching by basename at any depth.
Linked Issues check	✅ Passed	The PR implements basename matching for slash-free globs, preserves slashed anchoring, keeps grep/glob behavior aligned, and adds coverage.
Out of Scope Changes check	✅ Passed	The changes stay focused on glob matching semantics, related docs, and tests; no unrelated edits are evident.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/grep-glob-basename-178

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