fix: add --no-messages and tolerate exit code 2 in glob/grep tools

[aaronkyriesenbach]

Summary

• Fix glob and grep tools failing when broken/dangling symlinks exist in the search path
• Ripgrep exit code 2 (partial I/O errors) was treated as fatal, discarding valid stdout results

Changes

• src/tools/glob/constants.ts: Add --no-messages to RG_FILES_FLAGS to suppress non-fatal I/O warnings
• src/tools/glob/cli.ts: Change exit code check from > 1 to > 2 so broken symlinks don't discard valid results
• src/tools/grep/constants.ts: Add --no-messages to RG_SAFETY_FLAGS (same fix)
• src/tools/grep/cli.ts: Change exit code check from > 1 to > 2 (same fix)
• src/tools/glob/cli.test.ts: Add test verifying --no-messages is included in ripgrep args

Testing

bun run typecheck
bun test src/tools/glob/cli.test.ts

All 19 glob CLI tests pass, typecheck clean.

Related Issues

Closes #3726

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Summary by cubic

Fix glob and grep to handle broken/dangling symlinks without dropping valid results by adding --no-messages to ripgrep flags and treating exit code 2 as non‑fatal. Closes #3726.

^{Written for commit 7056fc1. Summary will update on new commits. Review in cubic}

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[aaronkyriesenbach]

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