[CI] allow manual Stage 1 dispatch

[BumpyClock]

Summary

Add workflow_dispatch to the Stage 1 workflow on the default branch. GitHub only exposes manual dispatch after the trigger exists on the default branch.

This one-file change enables exact candidate-branch SHA rehearsals. It does not change any job, command, evidence claim, or artifact.

Validation

• Parsed .github/workflows/stage1.yml with Ruby YAML.
• Confirmed the branch contains one workflow-line change.

Scope

No package, release, or tag is created.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 96a39acf-da37-46d7-a305-85ed57f58824

📥 Commits

Reviewing files that changed from the base of the PR and between 354486e and 41a7fee.

📒 Files selected for processing (1)

• .github/workflows/stage1.yml

Included review availability: 9 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 10 reviews per hour.

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Summary by CodeRabbit

• New Features
  • Added the ability to manually run the Stage 1 workflow when needed.

Walkthrough

The Stage 1 workflow now supports manual execution through workflow_dispatch while retaining its existing triggers.

Changes

Stage 1 workflow execution

Layer / File(s)	Summary
Add manual workflow trigger .github/workflows/stage1.yml	The workflow accepts manual dispatches through workflow_dispatch.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 41a7f

This one-line workflow change enables manual Stage 1 dispatch without changing jobs, commands, artifacts, or release behavior; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: enabling manual Stage 1 workflow dispatch. It is concise and specific.
Description check	✅ Passed	The description explains the change, scope, and validation. It uses a Summary section instead of the required Problem and Change sections, and it omits the required Checklist and explicit command resu…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description explains the change, scope, and validation. It uses a Summary section instead of the required Problem and Change sections, and it omits the required Checklist and explicit command results. The core information is present, so the description is mostly complete.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch stage1-manual-trigger

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