feat: add Tower Log narrative event feed (Fixes #7)

Adds the tower_log DB table, a narrateEvent method on AgentService (Haiku-powered, stub-safe), a tower-log service that persists and broadcasts entries, a GET /api/tower-log REST endpoint, WebSocket bootstrap and real-time push, and a bottom-sheet Tower Log panel in the-matrix UI with fade-in animations and auto-scroll.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/db/src/schema/tower-log.ts

@@ -0,0 +1,10 @@
+import { pgTable, text, timestamp } from "drizzle-orm/pg-core";
+
+export const towerLog = pgTable("tower_log", {
+  id: text("id").primaryKey(),
+  narrative: text("narrative").notNull(),
+  eventType: text("event_type").notNull(),
+  agentId: text("agent_id"),
+  jobId: text("job_id"),
+  createdAt: timestamp("created_at").notNull().defaultNow(),
+});