refactor(daemon): stateful sense engine — JSON state, remove Signal Bus

Phase 2 of RFC #308: Stateful Sense refactor.

- SenseRuntime uses JSON file persistence instead of SQLite/Drizzle
- Sense compute now receives state and returns { state, workflow }
- IPC: replaced SignalMessage with ComputeResultMessage
- Removed Signal Bus entirely (on[] now uses reverse-index in scheduler)
- sense-scheduler.onSenseCompleted() triggers dependent senses
- kernel no longer constructs Signal objects or calls routeSenseComputeOutput
- Removed drizzle-orm dependency from daemon package

Refs #308, closes #310

pnpm-lock.yaml

@@ -111,9 +111,6 @@ importers:
       '@uncaged/nerve-store':
         specifier: workspace:*
         version: link:../store
-      drizzle-orm:
-        specifier: 1.0.0-beta.23-c10d10c
-        version: 1.0.0-beta.23-c10d10c(@cloudflare/workers-types@4.20260425.1)(@types/better-sqlite3@7.6.13)(@types/mssql@9.1.11(@azure/core-client@1.10.1))(better-sqlite3@11.10.0)(mssql@11.0.1(@azure/core-client@1.10.1))(sql.js@1.14.1)(zod@4.3.6)
       yaml:
         specifier: ^2.8.3
         version: 2.8.3