Hook registry: list installed hooks + call counts in Injection panel

Add a process-wide hook registry (hook/src/hook_registry) that every hook
module registers its hooks with and bumps a counter from each detour. The
XInput, focus-spoof, and audio render-hooks now register their individual
hooks (XInputGetState/Ex/Caps/SetState; GetForegroundWindow/GetActiveWindow/
GetFocus/WndProc guard; IMMDevice::Activate, IAudioClient::Initialize/
GetService, IAudioRenderClient::GetBuffer/ReleaseBuffer) and count calls.

The worker publishes the table to the host each tick over a new HookStatus
field (protocol v4 -> v5: HookEntry[] + count). The Injection panel shows it
as a collapsible table grouped by subsystem with an installed flag and call
count per hook; coop_audio_probe prints the same table headless.

Verified against Phantom Brave: 13 hooks listed with live counts (focus APIs
polled heavily, GetBuffer/ReleaseBuffer ticking with the audio render loop).
All four tests pass.

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

README.md

@@ -112,6 +112,11 @@ Done:
   forwarding, controller polling rate, mirror resolution, audio source + buffered
   ms) and reveal the verbose diagnostics (per-slot poll table, focus-API counts,
   input-path detection, per-render-stream table) only when Debug details is on.
+- **Installed-hooks list. ✅** The DLL keeps a registry of every individual hook
+  it installs (XInput, focus, audio), with a running call counter per hook,
+  reported over IPC. The Injection panel shows it grouped by subsystem
+  (input / focus / audio) so you can see exactly what's hooked and how busy each
+  hook is. `coop_audio_probe` prints the same table headless.
 
 Future work, roughly in priority order: