fix: Skip Claude Code actions on fork PRs

[raifdmueller]

Summary

Prevents Claude Code GitHub Actions from running on pull requests from forks, where they would fail due to missing ANTHROPIC_API_KEY secret.

Problem

When external contributors create PRs from forks:

• Forks don't have access to repository secrets
• Claude Code actions fail with authentication errors
• Creates noise in the CI/CD pipeline

Changes

claude-code-review.yml

Added condition to skip entirely for fork PRs:

if: github.event.pull_request.head.repo.full_name == github.repository

claude.yml

Added fork checks for PR-related events:

• pull_request_review_comment: Skip if from fork
• pull_request_review: Skip if from fork
• issue_comment: Allow (will fail gracefully if on fork PR, but we can't detect that easily)
• issues: Allow (not fork-specific)

Behavior

Before:

• Fork PRs → Claude actions run → Fail with authentication error

After:

• Fork PRs → Claude actions skipped
• Same-repo PRs → Claude actions run normally
• Regular issues → Claude actions run normally

Testing

This will be automatically tested when:

1. A fork PR is created (actions should be skipped)
2. A same-repo PR is created (actions should run)

Notes

• issue_comment events on fork PRs will still trigger but fail gracefully (acceptable trade-off, as we can't easily detect fork status for issue comments)
• This follows GitHub Actions best practices for handling fork PRs with secrets

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