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/mainview/App.svelte

@@ -258,6 +258,9 @@
     keybindingStore.on("group4", () => setActiveGroup(getGroups()[3]?.id));
     keybindingStore.on("minimize", () => handleMinimize());
 
+    // Bug 3: Persist window frame on resize (debounced inside saveWindowFrame)
+    window.addEventListener("resize", saveWindowFrame);
+
     function handleSearchShortcut(e: KeyboardEvent) {
       if (e.ctrlKey && e.shiftKey && e.key === "F") {
         e.preventDefault();
@@ -316,7 +319,7 @@
       clearInterval(sessionId);
       document.removeEventListener("keydown", handleSearchShortcut);
       window.removeEventListener("palette-command", handlePaletteCommand);
-      // Native resize — no JS listeners to clean
+      window.removeEventListener("resize", saveWindowFrame);
     };
   });
 </script>

ui-electrobun/src/mainview/agent-store.svelte.ts

@@ -549,6 +549,9 @@ async function _startAgentInner(
   if (!result.ok) {
     sessions[sessionId].status = 'error';
     sessions[sessionId].error = result.error;
+    // Bug 1: Clear the dead session so the next send starts fresh
+    projectSessionMap.delete(projectId);
+    clearStallTimer(sessionId);
   }
 
   return result;

ui-electrobun/src/mainview/notifications-store.svelte.ts

@@ -15,13 +15,9 @@ export interface Notification {
 
 // ── State ─────────────────────────────────────────────────────────────────
 
-let notifications = $state<Notification[]>([
-  { id: 1, message: 'Agent completed: wake scheduler implemented', type: 'success', time: '2m ago' },
-  { id: 2, message: 'Context pressure: 78% on agent-orchestrator', type: 'warning', time: '5m ago' },
-  { id: 3, message: 'PTY daemon connected', type: 'info', time: '12m ago' },
-]);
+let notifications = $state<Notification[]>([]);
 
-let nextId = $state(100);
+let nextId = $state(1);
 
 // ── Public API ────────────────────────────────────────────────────────────