Switch from workflow_dispatch to repository_dispatch for cross-repo
triggering of issue-detective workflow in claude-cli-internal.
Changes:
- Use gh api with repository_dispatch endpoint
- Send issue_url in client_payload
- Support ISSUE_NOTIFY_TOKEN secret for better permissions
- Remove dependency on ISSUE_NOTIFY_WORKFLOW_NAME secret
This enables automatic issue detective analysis when issues are
opened in claude-code repository.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
