chore(process): add feature-removal sweep checklist (#908)

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,17 @@
+## Description
+<!-- Briefly describe what this PR does and why. -->
+
+## Checklist
+- [ ] Tests pass locally
+- [ ] CHANGELOG.md updated (if user-facing)
+- [ ] TypeScript builds cleanly
+
+## Feature-removal sweep
+**Skip this section if this PR doesn't remove a route, handler, endpoint, model, or toggle.**
+
+When removing a feature, ensure no orphan code is left behind:
+- [ ] Orphan Prisma models removed (or depended-upon by other models)
+- [ ] Broken or stale test files removed
+- [ ] Unused type aliases removed
+- [ ] Imports/exports cleaned up
+- [ ] ADRs and CONTEXT.md cross-references updated

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Internal
 - fix(ci): group $GITHUB_STEP_SUMMARY redirects in madge workflow to satisfy shellcheck SC2129 (#905)
 - test(shared): add `coverageThreshold` gate to `packages/shared/jest.config.cjs` (no-regression floor at current baseline -2%, statements=19/branches=16/functions=15/lines=18) (#909)
+- chore(process): add Feature-removal sweep checklist to PR template + advisory dangerfile guard that flags PRs with removal-pattern commits missing the sweep (#908)
 
 ## [2.11.0] - 2026-05-15
 

dangerfile.ts

@@ -135,6 +135,31 @@ if (!validPrefixes.test(headRef) && !headRef.startsWith('worktree-')) {
     )
 }
 
+
+// --- 9. Feature-removal sweep guard -----------------------------------------
+// When a commit message indicates feature/route/model removal,
+// flag if the PR body doesn't mention the sweep checklist.
+const removalVerb = /\b(remove|delete|retire|drop|deprecate)\b/i
+const removalTarget = /\b(route|handler|endpoint|model|toggle|feature)\b/i
+const prBody = pr.body || ''
+const hasSweepChecklistInBody = /feature-removal sweep/i.test(prBody)
+const hasRemovalCommit = danger.git.commits.some(
+    (c) => removalVerb.test(c.message) && removalTarget.test(c.message),
+)
+
+if (hasRemovalCommit && !hasSweepChecklistInBody) {
+    const baseRepo = pr.base.repo.full_name
+    const baseRef = pr.base.ref
+    const adrPath = 'docs/decisions/2026-05-19-retire-per-guild-feature-toggles.md'
+    const adrUrl = `https://github.com/${baseRepo}/blob/${baseRef}/${adrPath}`
+    warn(
+        `This PR appears to remove a feature or route (detected in commit message). ` +
+            `Please fill in the **Feature-removal sweep** checklist in the PR template ` +
+            `to ensure no orphan code (models, tests, types, imports) is left behind. ` +
+            `[See ${adrPath}](${adrUrl}) for context.`,
+    )
+}
+
 // --- 8. Big-file warning ----------------------------------------------------
 // Files > 500 lines are review-hostile. Flag new ones.
 async function checkLargeFiles(): Promise<void> {