fix(electrobun): 7 bug fixes + 3 partial features completed

Bugs fixed:
- Agent retry: clear dead session on failed start (was non-recoverable)
- seqId persist: save seq_id column in agent_messages, migrate existing DBs
- Window frame save: wire resize event listener to saveWindowFrame()
- Diagnostics counters: real RPC call counter via withRpcCounting() proxy

Partial features completed:
- Search auto-seed: rebuildIndex() on startup + indexMessage() on save
- Notifications: removed 3 hardcoded demo entries, start empty
- Agent cost streaming: emitCostIfChanged() on every message batch

New: src/bun/rpc-stats.ts (RPC call + dropped event counters)

ui-electrobun/src/bun/index.ts

@@ -29,6 +29,7 @@ import { createRemoteHandlers } from "./handlers/remote-handlers.ts";
 import { createGitHandlers } from "./handlers/git-handlers.ts";
 import { createProviderHandlers } from "./handlers/provider-handlers.ts";
 import { createMiscHandlers } from "./handlers/misc-handlers.ts";
+import { incrementRpcCallCount, incrementDroppedEvents } from "./rpc-stats.ts";
 
 /** Current app version — sourced from electrobun.config.ts at build time. */
 const APP_VERSION = "0.0.1";
@@ -74,7 +75,7 @@ const rpcRef: { send: Record<string, (...args: unknown[]) => void> } = { send: {
 const ptyHandlers = createPtyHandlers(ptyClient);
 const filesHandlers = createFilesHandlers();
 const settingsHandlers = createSettingsHandlers(settingsDb);
-const agentHandlers = createAgentHandlers(sidecarManager, sessionDb, rpcRef);
+const agentHandlers = createAgentHandlers(sidecarManager, sessionDb, rpcRef, searchDb);
 const btmsgHandlers = createBtmsgHandlers(btmsgDb, rpcRef);
 const bttaskHandlers = createBttaskHandlers(bttaskDb, rpcRef);
 const searchHandlers = createSearchHandlers(searchDb);
@@ -89,24 +90,42 @@ const miscHandlers = createMiscHandlers({
 // Window ref — handlers use closure; set after mainWindow creation
 let mainWindow: BrowserWindow;
 
+// ── RPC counter wrapper ─────────────────────────────────────────────────────
+
+/** Wrap each handler to increment the RPC call counter on every invocation. */
+function withRpcCounting<T extends Record<string, (...args: unknown[]) => unknown>>(handlers: T): T {
+  const wrapped: Record<string, (...args: unknown[]) => unknown> = {};
+  for (const [key, fn] of Object.entries(handlers)) {
+    wrapped[key] = (...args: unknown[]) => {
+      incrementRpcCallCount();
+      return fn(...args);
+    };
+  }
+  return wrapped as T;
+}
+
 // ── RPC definition ─────────────────────────────────────────────────────────
 
+const allHandlers = withRpcCounting({
+  ...ptyHandlers,
+  ...filesHandlers,
+  ...settingsHandlers,
+  ...agentHandlers,
+  ...btmsgHandlers,
+  ...bttaskHandlers,
+  ...searchHandlers,
+  ...pluginHandlers,
+  ...remoteHandlers,
+  ...gitHandlers,
+  ...providerHandlers,
+  ...miscHandlers,
+});
+
 const rpc = BrowserView.defineRPC<PtyRPCSchema>({
   maxRequestTime: 120_000,
   handlers: {
     requests: {
-      ...ptyHandlers,
-      ...filesHandlers,
-      ...settingsHandlers,
-      ...agentHandlers,
-      ...btmsgHandlers,
-      ...bttaskHandlers,
-      ...searchHandlers,
-      ...pluginHandlers,
-      ...remoteHandlers,
-      ...gitHandlers,
-      ...providerHandlers,
-      ...miscHandlers,
+      ...allHandlers,
 
       // GTK native drag/resize — delegates to window manager (zero CPU)
       "window.beginResize": ({ edge }: { edge: string }) => {
@@ -202,13 +221,6 @@ relayClient.onStatus((machineId, status, error) => {
 // ── App window ────────────────────────────────────────────────────────────
 
 async function getMainViewUrl(): Promise<string> {
-  // TEMPORARY: load resize test stub via Vite dev server (keeps RPC bridge)
-  const RESIZE_TEST = false; // DISABLED — real app mode
-  if (RESIZE_TEST) {
-    const testUrl = DEV_SERVER_URL + "/resize-test.html";
-    console.log(`[RESIZE_TEST] Loading stub via Vite: ${testUrl}`);
-    return testUrl;
-  }
   const channel = await Updater.localInfo.channel();
   if (channel === "dev") {
     try {
@@ -224,6 +236,14 @@ async function getMainViewUrl(): Promise<string> {
 
 connectToDaemon();
 
+// Partial 1: Seed FTS5 search index on startup
+try {
+  searchDb.rebuildIndex();
+  console.log("[search] FTS5 index seeded on startup");
+} catch (err) {
+  console.error("[search] Failed to seed FTS5 index:", err);
+}
+
 const url = await getMainViewUrl();
 
 const savedX      = Number(settingsDb.getSetting("win_x")      ?? 100);