Add additional test cases for opencode-hooks matcher sanitization

[dyoshikawa]

Summary

Follow-up from PR #1012 code review. Minor test coverage improvements suggested for validateAndSanitizeMatcher in opencode-hooks.

Tasks

• Add test for backslash-containing matchers (e.g., \bWrite\b) to verify double-escaping produces correct generated code
• Add test for NUL byte (\0) stripping (currently \n/\r are tested but \0 is not)
• (Optional) Consider extracting the control character set (\n, \r, \0) into a shared constant between hasControlChars in hooks.ts and validateAndSanitizeMatcher in opencode-hooks.ts to prevent drift

Context

• PR fix: opencode-hooks followup - gitignore, matcher sanitization, tests #1012: fix: opencode-hooks followup - gitignore, matcher sanitization, tests
• These are non-blocking improvements identified during code review

[dyoshikawa]

[ai] やってください glm

[github-actions]

Created PR #1019

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