Merge branch 'main' into dev

Surgical merge of 74 commits from main into dev. Key features ported:

- Provider visibility gating (appVersion filtering for Pi/Copilot)
- Pi agent provider + Copilot re-enabled
- Provider-declared features system (Codex fast mode)
- Workspace dedup by worktree root (adapted to integer IDs)
- Bulk close archiving fix for stored agents
- Agent creation timeout increase to 60s
- Audio/voice crash fixes (external buffer copies)
- Multi-host setup fix
- Reload agent tab action

Dev architecture preserved: SQLite storage, service proxy,
workspace setup dialog, hover cards, removed launcher tabs.

packages/app/src/components/icons/pi-icon.tsx

@@ -0,0 +1,19 @@
+import Svg, { Path } from "react-native-svg";
+
+interface PiIconProps {
+  size?: number;
+  color?: string;
+}
+
+export function PiIcon({ size = 16, color = "currentColor" }: PiIconProps) {
+  return (
+    <Svg width={size} height={size} viewBox="0 0 800 800" fill={color}>
+      <Path
+        d="M165.29 165.29 H517.36 V400 H400 V517.36 H282.65 V634.72 H165.29 Z M282.65 282.65 V400 H400 V282.65 Z"
+        fill={color}
+        fillRule="evenodd"
+      />
+      <Path d="M517.36 400 H634.72 V634.72 H517.36 Z" fill={color} />
+    </Svg>
+  );
+}