[product-manager-impersonator] Single-workflow compile target #1063

Feature Idea

Summary: Add an optional targeted compile command (make compile-workflow WORKFLOW=<name>) so maintainers can regenerate only one workflow’s generated files during edits.

Why a Customer Would Want This

Workflow maintainers usually touch one workflow at a time, but today the documented path always recompiles and re-syncs the entire catalog. That makes iteration slower and creates large unrelated generated diffs, which is frustrating for contributors and reviewers.

Rough Implementation Sketch

• Add a compile-workflow Make target that requires WORKFLOW=<name> and compiles only the matching workflow source/lock file.
• Extend scripts/dogfood.sh with an optional workflow filter so sync can regenerate only trigger-<name>.yml (including existing dogfood override and remediation-chain behavior).
• Keep make compile as the full-repo path; the new target is additive for focused edits.
• Document the new command in gh-agent-workflows/DEVELOPING.md next to the current make compile guidance.

Why It Won't Be That Hard

This is a focused ergonomics improvement with a small implementation surface (Makefile target + optional filter in one script + docs). It reuses existing compile/sync logic rather than introducing a new build system path.

Evidence

• Makefile#L54-L63 lists current make targets and only exposes full compile.
• Makefile#L167-L183 shows compile always runs full sync plus full compile/postprocess steps.
• scripts/dogfood.sh#L55-L150 iterates all gh-agent-workflows/*/example.yml, regenerating all triggers every run.
• gh-agent-workflows/DEVELOPING.md#L145-L154 documents make compile as the standard edit loop, with no targeted compile option.
• Recent PR flow is active and frequent (for example feat(issue-triage): expose GH_AW_GITHUB_TOKEN in workflow_call contract #1026, Add classification-labels input and add-labels safe output to Issue Triage #1030), so tighter iteration loops would pay off immediately for maintainers.

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

What is this? | From workflow: Trigger Product Manager Impersonator

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