[plan] Configure safeinputs-gh for Daily Copilot PR Merged workflow

[github-actions]

Objective

Resolve the missing safeinputs-gh tool error in the Daily Copilot PR Merged workflow.

Context

The Daily Copilot PR Merged workflow reported a missing-tool error for safeinputs-gh. This tool is needed for safely reading inputs from GitHub context in Copilot-based workflows.

Approach

1. Locate the Daily Copilot PR Merged workflow file
2. Add the safeinputs-gh action to the workflow steps:

   - uses: actions/setup-safe-inputs@...

3. Verify the action is properly configured and available
4. Check if safeinputs-gh is a custom action that needs to be built/published
5. Test the workflow with a recent PR merge event
6. Confirm the tool is accessible during execution

Files to Investigate

• .github/workflows/daily-copilot-pr-merged.md (or similar)
• actions/setup-safe-inputs/ (if custom action)
• Workflow logs showing the missing-tool error

Acceptance Criteria

• safeinputs-gh tool is available in the workflow
• Missing-tool error is resolved
• Workflow can successfully process PR merge events
• Test run completes without errors
• Configuration is documented
  Related to [plan] Address workflow health and issue triage findings from DeepReport 2025-12-22 #7280

AI generated by Plan Command for discussion #7277