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docs/README.md

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+# Docs
+
+**Tracked:** shared checklists and templates (e.g. `MANUAL_LAUNCH_CHECKLIST.md`, `*.example.md`).
+
+**Gitignored (see repo root `.gitignore`):**
+
+- `IMPLEMENTATION_DECISIONS.md` — your copy from `IMPLEMENTATION_DECISIONS.example.md` (`npm run init:custom`).
+- Any `**/*.local.md` under `docs/` — scratch or personal notes.
+- Everything in `_private/` except `.gitkeep` — drop arbitrary private notes or exports here.
+
+Product requirements live under `PRDs/` (see `PRDs/README.md`); only `PRD.template.md` is committed there.