Rebase onto dev: reconcile code-mode + direct mode on its own runtime

Rebased new-runtime onto dev (which added code-mode on the old runs-based
runtime). Reconciliation: kept the generic event-log + bus (runs/repo.ts,
runs/bus.ts, a trimmed runs.ts = createRun + fetchRun only) decoupled from the
retired LLM runtime; restored the runsRepo DI registration and the
bus -> runs:events forwarder.

Step 1 of the code-mode migration — direct mode on its own dedicated runtime:
- new SQLite-backed CodeEventStore (migration 0008 + code_session_events) replaces
  the runs JSONL log for code sessions
- dedicated codeEventBus (InMemoryBus) + codeSession:events feed +
  codeSession:getEvents history channel, replacing the shared bus / runs:events /
  runs:fetch for code
- CodeSessionService mints its own id (drops createRun) and writes to
  codeEventStore / codeEventBus; status-tracker subscribes to codeEventBus
- renderer (use-code-chat) loads history via codeSession:getEvents and streams via
  codeSession:events

Rowboat mode is temporarily disabled in the UI (its old copilot-LLM path is
retired); it moves onto the new sessions runtime in step 2.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/x/packages/shared/src/ipc.ts

@@ -19,9 +19,9 @@ import { RowboatApiConfig } from './rowboat-account.js';
 import { ZListToolkitsResponse } from './composio.js';
 import { BrowserStateSchema } from './browser-control.js';
 import { BillingInfoSchema } from './billing.js';
-import { EmailBlockSchema, GmailThreadSchema } from './blocks.js';
+import { GmailThreadSchema } from './blocks.js';
 import { PermissionDecision, ApprovalPolicy, CodingAgent } from './code-mode.js';
-import { Run } from './runs.js';
+import { Run, RunEvent } from './runs.js';
 import { NotificationSettingsSchema } from './notification-settings.js';
 import { CodeProject, CodeSession, CodeSessionMode, CodeSessionStatus, GitRepoInfo, GitStatusFile } from './code-sessions.js';
 
@@ -572,6 +572,17 @@ const ipcSchemas = {
     }),
     res: z.null(),
   },
+  // Code-mode's own transcript history (replaces the generic runs:fetch).
+  'codeSession:getEvents': {
+    req: z.object({ sessionId: z.string() }),
+    res: z.object({ events: z.array(RunEvent) }),
+  },
+  // main → renderer: code-mode's live event feed (replaces runs:events). Carries
+  // the session's RunEvents (code-run-event, message, processing, …).
+  'codeSession:events': {
+    req: RunEvent,
+    res: z.null(),
+  },
   // ==========================================================================
   // Embedded terminal (Code section): one PTY per coding session
   // ==========================================================================