docs: Sprint 13 — F9-lite (Ollama Cloud free-text plan synthesis) across all 6 running docs

Sprint 13 (commit bae9403) splits the Sprint 11 "Generate Meal
Plan" CTA into a 2-step modal: "Use the recipe library" (default,
Sprint 11 unchanged) or "Ask the LLM" (new). The LLM path POSTs
to /api/llm/plan; the backend calls kimi-k2.6:cloud on ollama.com,
parses the LLM’s JSON picks, creates a fresh plan, fills the
LLM’s picks, and falls through to the Sprint 6+ fillEmptySlots
pattern for the slots the LLM didn’t cover. No pre-existing WIP
files touched.

This commit updates the 6 running docs that track the sprint:

- .agent/plan.md — Sprint 13 section (S13.1-S13.4) added.
- .agent/context.md — Sprint 13 (D1-D9, Q1-Q3) added; file:line
  references; key takeaways.
- Review/sprint13-verification.md — new file: 3-step browser
  smoke + 4 API curls + a11y check + 6-risk table + future
  work section.
- Review/ui-nielsen-audit.md — Sprint 13 status block (T7.1-T7.3)
  at the top, after the Sprint 12 block.
- fix-ui-audit.md — Sprint 13 section (T7.1-T7.5) added after
  the Sprint 12 section.
- Review/handoff-ui-audit.md — Batch I added to the deploy
  instructions; Sprint 13 section added after Sprint 12; TL;DR
  table row 13 added; Last-updated footer updated.
- docs/HANDOFF.md — Sprint 13 section added after the Sprint 12
  section, with a path-forward paragraph for F9-full.

All 6 docs now reflect Sprint 13. §Future backlog remaining:
F9-full (local Ollama model pull on the host) — opt-in based on
cloud-billing feedback. _ask_llm is the single seam: F9-full only
needs to swap the URL + model name.

Review/ui-nielsen-audit.md

@@ -131,6 +131,12 @@ The app looks polished on the surface (Tailwind palette, clean cards, working to
 > - **T6.4** Frontend: `frontend/src/api/index.ts` adds `recipes.search` + `recipes.importRecipe` + 3 stub methods (`recommended`, `listIngredients`, `createIngredient`) to satisfy pre-existing call sites that were previously hidden by a smaller API surface. `frontend/src/pages/Recipes.tsx` adds the toggle button (with `aria-pressed`) + the web-search panel (`<div role="region" aria-label="Web recipe search" aria-busy={webLoading}>`) + the import mutation (toast on success, `showApiError` on failure). `frontend/src/types/index.ts` adds optional `ingredient` + `is_optional` to `RecipeIngredient` for pre-existing MealDetail.tsx call sites.
 > - **T6.5** Pre-existing tsc errors exposed by the API surface expansion (5 errors in Pantry/MealDetail/Recommended.tsx) — resolved per user decision: added 5 stub API methods + 2 type fields. Documented in `Review/sprint12-verification.md` D-fix section.
 > - **Verification log:** `Review/sprint12-verification.md` (deploy + 4-step browser smoke + 2 API curls + quota test + a11y check + 5-risk table). Deploy is `git pull` + `docker compose up -d --build backend frontend` (backend has the new router; frontend has the new toggle).
+>
+> **Sprint 13 status (committed 2026-06-05, awaiting deploy):** F9-lite — splits the Sprint 11 "Generate Meal Plan" CTA into a 2-step modal: the user picks "Use the recipe library" (default, Sprint 11's flow) or "Ask the LLM" (new). The LLM path POSTs to `/api/llm/plan`; the backend calls `kimi-k2.6:cloud` on `ollama.com`, parses the LLM's JSON picks, creates a fresh plan, fills the LLM's picks, and falls through to the Sprint 6+ `fillEmptySlots` pattern for the slots the LLM didn't cover. **No pre-existing WIP files touched.** F9-full (local Ollama model pull on the host) remains a future sprint.
+> - **T7.1** `backend/app/api/llm_plan.py` (NEW, ~280 lines). 1 endpoint (`POST /api/llm/plan` body `{prompt, week_start}`) + 4 helpers (`_ensure_ollama_configured`, `_serialize_library` with a 200-recipe cap, `_ask_llm` mirroring the `llm_matcher._ask_ollama` pattern, `_parse_picks` tolerant of markdown code fences, `_validate_picks` that drops invalid entries). 60s timeout, 422 on empty/oversized prompt, 503 on missing OLLAMA_API_KEY, 400 on duplicate week.
+> - **T7.2** `backend/app/schemas/__init__.py` — added `LLMPlanRequest` + `LLMPlanResponse` Pydantic models. The router is registered in `main.py:65-66` at the `/api/llm` prefix.
+> - **T7.3** Frontend: `frontend/src/api/index.ts` adds `llm.plan(data)`. `frontend/src/pages/Dashboard.tsx` adds the prompt modal (radio for library vs. LLM + textarea for the LLM path with 500-char counter) + extracted Sprint 11's body into `generateFromLibrary` + added `generateFromLLM`. New state: `showPromptModal`, `promptMode`, `promptText`, `promptBusy`. Click-outside-to-dismiss is disabled while `promptBusy` is true. The textarea `autoFocus`es when LLM mode is selected.
+> - **Verification log:** `Review/sprint13-verification.md` (deploy + 3-step browser smoke + 4 API curls + a11y check + 6-risk table). Deploy is `git pull` + `docker compose up -d --build backend frontend` (no migration, no new dependencies).
 > - **No new dependencies. No migration. Admin path unchanged.**
 >
 > **Sprint 6 status (commit `8ad4ef6`, awaiting deploy):** Two §Future items, both with design decisions captured in the commit message.