ci(claude): enable @claude to fix bugs and commit from comments

Configure the @claude summon workflow so it can actually produce a
verified fix when asked in an issue/PR comment:

- use_commit_signing: bot commits show as Verified
- --allowedTools Bash: lets Claude build/test to verify the fix before
  committing (default allowlist blocks Bash). Safe because the job `if`
  gate restricts this to OWNER/MEMBER/COLLABORATOR.
- --max-turns 30: enough turns to investigate -> fix -> verify

Auto-commit/PR is already built into claude-code-action and the
required write permissions were already present, so no permission
changes are needed.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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