Add ideas_from_ingredients skill and job

Implement the ideas_from_ingredients v1 skill on the AI harness: it asks
for 8 ideas {name, uses[], missing[], est_minutes, method, difficulty,
search_query}, keeps only "uses" entries whose harness.Normalize form is
one of the household's listed ingredients (written as the household wrote
them, in its order), drops ideas using none or repeating another, and
computes the summary line from the corrected lists.

Add internal/ideas: an ideas_from_ingredients job that grounds the ideas
with Grounder.GroundMany in the model's order until 5 are kept, drops the
ungroundable ones and, for quick_only, those whose grounded recipe is not
a Quick dinner (crockpot or minutes_total <= 30), publishing the result
as each idea is kept. POST /api/v1/ideas/from-ingredients answers 202
{jobId}.

Maestro task c3c5f98e-7f7d-4c6b-a1ab-d45bb8e497f9.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/ai/skills/prompts/checksums.txt

@@ -6,3 +6,4 @@ normalize_recipe v1 7174e5479fc020f3b2b39953d85411381aea26defb9943145e7864c5b752
 suggest_side_quests v1 bd54d7bf9aea0980059a346e5f40ff4c866b80ef9bb9f74e7cbd413be0911c8a
 draft_week v1 e637419690d9532bab53cb8ca01b73a079ecfe8e3022522c05188d18e9740f32
 archive_title v1 b4f30562a8614dac09a69d512dc361883b917ee4228a0ce3b4583c7fd3f6101a
+ideas_from_ingredients v1 49df3e134f07fe2c0dbbda7bd3d7d1364731e5851bf6f6a526ec04b703480924

internal/ai/skills/prompts/ideas_from_ingredients.v1.tmpl

@@ -0,0 +1,25 @@
+{{/* ideas_from_ingredients drafts dinner ideas the household can cook from the ingredients it has on hand. */}}
+{{define "instructions" -}}
+You suggest dinner ideas the household can cook from the ingredients it has on hand, listed under "Ingredients on hand" in the household context.
+
+Prefer ideas that use as many of those ingredients as possible and need as few others as possible. Pantry staples such as salt, pepper, oil and water need not be listed as missing. Vary the ideas: no two may be the same dish.
+
+Give for each idea:
+- name: the dinner's usual name, as a recipe site would title it.
+- uses: the ingredients on hand the idea uses, each written exactly as it appears in the "Ingredients on hand" list. List only ingredients from that list, never one it does not hold.
+- missing: the ingredients the idea needs that are not on hand, each with a quantity where it helps, e.g. "1 lime". Leave it empty when nothing is missing.
+- est_minutes: your estimate of the whole minutes from starting prep to the table.
+- method: how it is mainly cooked: "stovetop", "oven", "crockpot" (slow cooker or crock pot), "grill" or "other".
+- difficulty: "easy", "medium" or "hard" for a home cook.
+- search_query: a web search query that finds a recipe for this dinner.
+{{- if .QuickOnly}}
+
+The household wants Quick dinners only: each idea must be cooked in a crock pot, or take 30 minutes or less from prep to table.
+{{- end}}
+
+One valid idea, for a household with "chicken thighs", "rice" and "cilantro" on hand (an example only, not about this household):
+{"name": "Cilantro Lime Chicken and Rice", "uses": ["chicken thighs", "rice", "cilantro"], "missing": ["1 lime"], "est_minutes": 35, "method": "stovetop", "difficulty": "easy", "search_query": "cilantro lime chicken and rice recipe"}
+{{- end}}
+{{define "user" -}}
+Suggest {{.Count}} dinner ideas from the ingredients on hand.
+{{- end}}