chat: retire the old saved-session store (Stage 4a)

Deletes all session persistence that isn't Claude's native transcript store, per
the "only harness-native session management survives" rule.

Backend: delete api/pi/storage.ts (meta.json+messages.json file store), the
api/saved-sessions router (+ unmount), the /pi/sessions REST endpoints, and the
storage.save/loadSession calls in the chat WS handler (in-memory session-manager
stays for live turns; no disk persistence — Claude's transcript is the record).
Also drops the Postgres saved_sessions layer: schema/chat.ts, queries/saved-sessions.ts,
its types and re-exports.

Frontend: delete state/useSavedSessions, ChatList, and the ChatHistory Widget
(all pure saved-session UI); slim ChatHeader to a label; strip the auto-load-latest
+ Save wiring from ChatPanelWrapper and ChatDetailPanel; drop the old resume path
from useChat and SessionListPage; remove the /chat/saved/:id route and the
useInitialData prefetch.

Behavior removed (intended): the Save-session button, email/project panels
auto-resuming the last chat, and /chat/saved/:id. /chat itself is unchanged —
already fully on Claude transcripts. The orphaned saved_sessions Postgres table
is dropped on the next `bun db:push`.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/databases/officer_db/src/index.ts

@@ -64,13 +64,6 @@ export {
   upsertDefaults,
 } from './queries/dashboards';
 
-export {
-  listSavedSessions,
-  getSavedSession,
-  createSavedSession,
-  updateSavedSessionMessages,
-  deleteSavedSession,
-} from './queries/saved-sessions';
 
 export {
   createPipelineJob,

src/databases/officer_db/src/queries/saved-sessions.ts

@@ -1,59 +0,0 @@
-import { eq, and, desc } from 'drizzle-orm';
-import { db } from '../db';
-import { savedSessions } from '../schema';
-import type { SavedSessionInsert, SavedSessionSelect } from '../types';
-
-export async function listSavedSessions(userId: number): Promise<Omit<SavedSessionSelect, 'rawMessages'>[]> {
-  const rows = await db
-    .select({
-      id: savedSessions.id,
-      userId: savedSessions.userId,
-      provider: savedSessions.provider,
-      context: savedSessions.context,
-      contextId: savedSessions.contextId,
-      title: savedSessions.title,
-      summary: savedSessions.summary,
-      cwd: savedSessions.cwd,
-      cost: savedSessions.cost,
-      createdAt: savedSessions.createdAt,
-    })
-    .from(savedSessions)
-    .where(eq(savedSessions.userId, userId))
-    .orderBy(desc(savedSessions.createdAt));
-  return rows;
-}
-
-export async function getSavedSession(id: number, userId: number): Promise<SavedSessionSelect | undefined> {
-  const rows = await db
-    .select()
-    .from(savedSessions)
-    .where(and(eq(savedSessions.id, id), eq(savedSessions.userId, userId)));
-  return rows[0];
-}
-
-export async function createSavedSession(data: SavedSessionInsert): Promise<SavedSessionSelect> {
-  const rows = await db.insert(savedSessions).values(data).returning();
-  return rows[0]!;
-}
-
-export async function updateSavedSessionMessages(
-  id: number,
-  userId: number,
-  rawMessages: unknown,
-  cost: unknown,
-): Promise<boolean> {
-  const result = await db
-    .update(savedSessions)
-    .set({ rawMessages, cost })
-    .where(and(eq(savedSessions.id, id), eq(savedSessions.userId, userId)))
-    .returning({ id: savedSessions.id });
-  return result.length > 0;
-}
-
-export async function deleteSavedSession(id: number, userId: number): Promise<boolean> {
-  const result = await db
-    .delete(savedSessions)
-    .where(and(eq(savedSessions.id, id), eq(savedSessions.userId, userId)))
-    .returning({ id: savedSessions.id });
-  return result.length > 0;
-}

src/databases/officer_db/src/schema/chat.ts

@@ -1,22 +0,0 @@
-import { pgTable, serial, text, integer, timestamp, jsonb, index } from 'drizzle-orm/pg-core';
-import { users } from './auth';
-
-export const savedSessions = pgTable(
-  'saved_sessions',
-  {
-    id: serial('id').primaryKey(),
-    userId: integer('user_id')
-      .notNull()
-      .references(() => users.id, { onDelete: 'cascade' }),
-    provider: text('provider').notNull(),
-    context: text('context'),
-    contextId: text('context_id'),
-    title: text('title').notNull(),
-    summary: text('summary').notNull(),
-    rawMessages: jsonb('raw_messages').notNull(),
-    cwd: text('cwd').notNull(),
-    cost: jsonb('cost').notNull(),
-    createdAt: timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),
-  },
-  (table) => [index('idx_saved_sessions_user_created').on(table.userId, table.createdAt)],
-);

src/databases/officer_db/src/schema/index.ts

@@ -1,6 +1,5 @@
 export * from './auth';
 export * from './user-data';
-export * from './chat';
 export * from './dashboards';
 export * from './operations';
 export * from './server';

src/databases/officer_db/src/types.ts

@@ -36,8 +36,6 @@ export type DockConfigInsert = typeof Schema.dockConfigs.$inferInsert;
 
 // ── Saved Sessions ──
 
-export type SavedSessionSelect = typeof Schema.savedSessions.$inferSelect;
-export type SavedSessionInsert = typeof Schema.savedSessions.$inferInsert;
 
 // ── Dashboards ──