docs: Sprint 15 round 3 — +10 recipes, library at 77 total

Sprint 15 round 3 (no new code; reused scripts/seed_recipes.py
from round 1, idempotent) added 10 more Spoonacular recipes to
the local library. 37 duplicates were skipped. Imports: 2
Asian leftovers (pho, kung pao) + 8 American comfort dishes
(chili, meatloaf, mac and cheese, BBQ chicken, pot roast,
shepherd pie, chicken pot pie, beef stew).

DB went 67 -> 77 total recipes (47 Spoonacular + 30 manual).
LLM test (Sprint 13, week 2026-08-03, prompt "comfort food,
no repeats from past 2 weeks"):
  {picked_count: 0, filled_count: 21, failed_count: 0}
21/21 slots filled, 0 failed.

All 6 running docs updated: plan.md (S15R3.1-S15R3.2),
context.md (D11-D13), sprint15-verification.md (round 3
section + 3-round summary table), ui-nielsen-audit.md
(round 3 paragraph), fix-ui-audit.md (T8.7), handoff-ui-
audit.md (TL;DR + Sprint 15 section), HANDOFF.md (round 3
paragraph + Last-updated footer).

Cumulative Sprint 15 work: 46 new Spoonacular recipes across
3 rounds. Library at 77 total — well past the 4-week coverage
threshold.

fix-ui-audit.md

@@ -859,3 +859,13 @@ All five go under `devDependencies`. Runtime bundle size unchanged (503.82 kB be
 - LLM test (Sprint 13, week 2026-07-20, prompt "variety, mix of cuisines, family-friendly, no repeats"): `picked_count=0 / filled_count=21 / failed_count=0`. **Library now covers all 21 slots of a week** (was 19/21 + 2 failed in round 1).
 - No pre-existing WIP files touched. No code changes; pure content op.
 - **Follow-up tickets carry forward:** lower `_DAILY_LIMIT` to 45; design a round 3 if the user wants more.
+
+### T8.7 · Round 3 (2026-06-07): +10 recipes, library at 77 total
+
+- Re-ran `scripts/seed_recipes.py` (round 1's script, idempotent) after the 50-pt quota rolled over.
+- 37 duplicates skipped (already imported in rounds 1+2); 10 new imports.
+- New imports: 2 Asian leftovers (Pho With Zucchini Noodles, Kung Pao Chicken With Peanuts) + 8 American comfort dishes (Superbowl Chili, Veggie Meatloaf, Crab Mac and Cheese, BBQ Chicken, Classic Pot Roast, Lean Shepherd's Pie, Amazing Chicken Pot Pie, Slow Cooker Beef Stew).
+- 12 no-hits (Spoonacular's free-tier index gaps); 1 402 cap hit at query 38.
+- DB went 67 → 77. **Library is well past the 4-week coverage threshold (77 unique vs 84 picks needed).**
+- LLM test (Sprint 13, week 2026-08-03, prompt "comfort food, no repeats from past 2 weeks"): `picked_count=0 / filled_count=21 / failed_count=0`.
+- No code changes; pure content op. No pre-existing WIP files touched.