diff --git a/.planning/ROADMAP.md b/.planning/ROADMAP.md
index 8b0d569..909a92c 100644
--- a/.planning/ROADMAP.md
+++ b/.planning/ROADMAP.md
@@ -410,3 +410,25 @@ Plans:
 Plans:
 
 - [ ] TBD (promote with /gsd-review-backlog when ready)
+
+### Phase 999.16: Wire a real linter (ESLint) so the CI lint gate actually fails on violations (BACKLOG)
+
+**Goal:** [Captured for future planning] The Phase 8 CI `fast-checks` job runs `pnpm lint`, but **no linter exists** in the repo — the root `lint` script is `pnpm -r --if-present lint`, which finds no package-level lint script and exits 0. The lint gate is a hollow placeholder that can never fail. Wire up a real linter so it runs and gates merges on lint violations. (`typecheck`/tsc already gates type errors meanwhile.)
+
+**Options / decisions to make when picking this up:**
+
+- **Tooling:** ESLint flat config (`eslint.config.js`) with `typescript-eslint`; add React + react-hooks plugins for `apps/pwa`. Add `eslint` (+ plugins) as devDeps and a `lint` script to `apps/api` and `apps/pwa` — `pnpm -r --if-present lint` then picks them up automatically, no CI change needed.
+- **Rule strictness:** pick a baseline (recommended vs strict-type-checked). Stricter = more upfront violations to fix.
+- **Violation cleanup (the real work):** the first run surfaces existing violations across both apps. Decide per-rule: fix, downgrade to warn, or disable. The gate must end green.
+- **Gating choice:** blocking on merge immediately, or advisory (warn-only) until the codebase is clean.
+
+**Boundary:** Phase 8 deliberately scoped lint wiring out (CI-plumbing-only); it shipped the gate slot wired to auto-activate once a package `lint` script lands. This item is that follow-up.
+
+**Context:** Raised during Phase 8 execution, 2026-06-11 — user noted the `--if-present` lint step "didn't fix the linter, just made it so it didn't have to exist to proceed" and wants a lint gate that actually fails. Tags: ci, lint, eslint, typescript-eslint, quality, gitea.
+
+**Requirements:** TBD
+**Plans:** 0 plans
+
+Plans:
+
+- [ ] TBD (promote with /gsd-review-backlog when ready)