ADR 62: Inline stages into reusable-dispatch.yml (per-repo only)

Context

Per-repo mode has a version skew problem: reusable-dispatch.yml references reusable-{stage}.yml@v0 via hardcoded uses: lines. During development/testing, changes to stage workflows aren't picked up because @v0 points to the released version. ADR 62 decides to inline all stage logic into reusable-dispatch.yml, eliminating the second uses: hop.

Per-org mode is unaffected (its flow goes through scaffold dispatch.yml → gh workflow run → thin callers → reusable-{stage}.yml@v0) and must not change. reusable-{stage}.yml files stay for per-org until it's removed per ADR 44.

Plan

Branch from main. Per-org scaffold files stay untouched — only reusable-dispatch.yml and the new composite action are changed.

1. Inline stage logic into reusable-dispatch.yml

Inline each reusable-{stage}.yml job directly into reusable-dispatch.yml, eliminating the uses: reusable-{stage}.yml@v0 hop. Verify:

• Route job logic matches main (no unintended routing changes)
• Each inlined stage job matches its corresponding reusable-{stage}.yml (same steps, permissions, concurrency)
• uses: reusable-{stage}.yml@v0 lines are gone
• Secrets (FULLSEND_GCP_WIF_PROVIDER, FULLSEND_GCP_PROJECT_ID) declared in on.workflow_call.secrets

2. Create prepare-workspace composite action

Add .github/actions/prepare-workspace/action.yml to DRY up workspace setup across the six inlined stage jobs.

3. Sync check: inlined stages vs reusable-{stage}.yml

For each stage (triage, code, review, fix, retro, prioritize), verify the inlined job in reusable-dispatch.yml matches the standalone reusable-{stage}.yml:

• Same permissions
• Same concurrency group pattern (agent-scoped)
• Same steps (checkout, prepare-workspace, mint-token, setup-gcp, setup-agent-env, run agent)
• Same stage-specific logic (fix: fork check, eligibility, review body; code: validation, bot identity; review: prior review; prioritize: no mint, no checkout)

Key difference allowed: inlined jobs use prepare-workspace composite action while standalone files have inline bash. The behavior must be equivalent.

4. Verify scaffold tests pass

Run go test ./internal/scaffold/... — scaffold files are unchanged so tests must still pass.

5. Verify workflow lint

Run any workflow linting (actionlint or similar) on both reusable-dispatch.yml and the restored reusable-{stage}.yml files.

Files changed

File	Action
.github/workflows/reusable-dispatch.yml	Modify (inline stage jobs)
.github/workflows/reusable-{code,fix,review,triage,retro,prioritize}.yml	Unchanged (kept for per-org)
.github/actions/prepare-workspace/action.yml	New (composite action)
internal/scaffold/...	Unchanged (per-org untouched)

Verification

1. go test ./... — full test suite passes
2. Diff each inlined stage job against its reusable-{stage}.yml counterpart to confirm sync
3. Manual review: per-org flow unchanged (shim → dispatch.yml → thin callers → reusable-{stage}.yml)
4. Manual review: per-repo flow works without version skew (shim → reusable-dispatch.yml with inlined stages)