Household context builder with token budget

harness.BuildContext reads the household context in one read transaction:
today and its weekday in the household timezone, Regulars (cuisine, method,
minutes, favorite), the Quest log, the last 60 passed Side quests and the
plans of the last four ISO weeks. A character budget trims the oldest plans
first, then the oldest passes, never Regulars; a budget too small for what
is never trimmed is an error.

Maestro task 2f54cec9-ec41-42af-b8ee-9e24b8c63057

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

migrations/queries/household_context.sql

@@ -0,0 +1,19 @@
+-- Reads for the AI household context block (internal/ai/harness).
+
+-- name: ListRecentDeclinedNames :many
+-- The names of the most recently declined suggestions, newest first.
+SELECT dinners.name
+FROM suggestions
+JOIN dinners ON dinners.id = suggestions.dinner_id
+WHERE suggestions.status = 'declined'
+ORDER BY suggestions.decided_at DESC, suggestions.id DESC
+LIMIT ?;
+
+-- name: ListPlannedDinners :many
+-- The planned dinners dated from from_date up to but not including
+-- to_date, oldest first. Days with no dinner are left out.
+SELECT plan_days.date, dinners.name
+FROM plan_days
+JOIN dinners ON dinners.id = plan_days.dinner_id
+WHERE plan_days.date >= sqlc.arg(from_date) AND plan_days.date < sqlc.arg(to_date)
+ORDER BY plan_days.date, plan_days.id;