Handle bare Design Decision Gate workflow dispatch

[Copilot]

Bare workflow_dispatch runs for Design Decision Gate could fail before the agent started because pr_number is optional in the trigger schema but required by the prefetch shell step. This made manual dispatches without PR context fail as gate errors.

• Workflow dispatch handling

  • Replaces the hard failure with a graceful skip path for bare dispatches.
  • Writes minimal prefetch artifacts so downstream steps have consistent files.

• Agent stop condition

  • Adds an explicit skip_reason path so the agent emits noop and stops instead of attempting PR analysis.

• Generated workflow

  • Recompiled design-decision-gate.lock.yml from the updated markdown source.

{
"pr_number": null,
"file_count": 0,
"requires_adr_by_default_volume": false,
"skip_reason": "workflow_dispatch did not include inputs.pr_number"
}

• Fixes[deep-report] Fix Design Decision Gate hard-fail on bare workflow_dispatch (pr_number codegen mismatch) #53174

[github-actions]

Thanks for working on fixing the Design Decision Gate hard-fail issue (#53174)! 🚀

This PR is currently in draft status with 0 file changes. Here's what we're tracking to get it ready for review:

To completion:

• Implement the fix — Update design-decision-gate.md and trigger a recompile to regenerate design-decision-gate.lock.yml to make pr_number genuinely optional (graceful skip) or mark it required: true in the schema.
• Add tests — Include workflow validation or integration tests that verify the Design Decision Gate no longer hard-fails when triggered via bare workflow_dispatch without a pr_number.
• Complete the checklist — Work through the remaining tasks in the PR description to validate the fix and confirm no regressions.

The issue is well-documented in #53174 — this should resolve the recurring workflow-dispatch failures. Once changes land, the diff will be reviewed.

Keep the draft status until the checklist is complete!

Generated by ✅ Contribution Check · auto · 47.7 AIC · ⌖ 3.22 AIC · ⊞ 9.1K · ◷

[Copilot]

Pull request overview

Handles missing PR context during bare Design Decision Gate dispatches.

Changes:

• Generates minimal prefetch artifacts for skipped dispatches.
• Instructs the agent to emit noop.
• Recompiles the generated workflow.

Show a summary per file

File	Description
.github/workflows/design-decision-gate.md	Adds graceful dispatch handling and skip instructions.
.github/workflows/design-decision-gate.lock.yml	Updates compiled workflow output.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Balanced

[github-actions]

🎉 This pull request is included in a new release.

Release: v0.87.1