feat(runtime/knowledge): SQLite knowledge base with starter intel + lessons

Per-server state/<host>/knowledge.db. Schema:
- recipes (seeded from docs/minecraft-recipes.json, 38 rows)
- mob_intel (15 mobs incl. creeper/zombie/skeleton with verdict_no_weapon)
- block_intel (30 blocks with required_tool / drops)
- lessons (12 starter rules — "don't attack creepers with fists", etc.)
- deaths / postmortems / poi / wiki_pages / chat_log / code_changes

Public API in runtime/knowledge/index.js: initKnowledge, recall, record,
markApplied, topAdvice, lookupRecipe/Mob/Block, insertDeath, insertPostmortem,
recordPOI, poiNearby, logChat. All operations gracefully no-op when
better-sqlite3 is unavailable.

10 tests; covers init, seeding, recall filters, lesson lifecycle, death/PM
round-trip, spatial POI queries, chat log.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

package-lock.json

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