Make inline-hook install AND remove safe to spam

The uncapped, input-polling mock_game_test storm (thousands of presents/s, now
also driving the input/focus/MKB hooks) drove out a family of install/remove races
the slow vsync'd mock had masked. Fixes (hook/src/hook_install.hpp + hook_guard.hpp):

- Persistent hooks. The old model created a hook on install and DESTROYED it on
  remove (= {}), freeing the trampoline; a detour about to call it (.stdcall) then
  hit freed memory -> 0xC0000005. drain() can't fully close that window (a thread
  can be inside the detour but not past its Guard ctor). So hooks are now created
  ONCE and only enable()/disable()d across install/remove cycles -- never destroyed
  during the session -- so a stale detour always calls a live trampoline (disabled,
  it just runs the original). Reused, so no churn and no leak. remove_* therefore
  disable()s + drain()s but does not destroy; install guards check .enabled().

- Install race. create_inline() enables the hook before the result is move-assigned
  into the global the detour reads; a call landing in the detour mid-assign reads a
  torn hook -> AV. install_inline() creates StartDisabled, assigns, then enable()s.

- drain() Sleep(1)s BEFORE each zero-check, so a thread that entered the detour but
  hasn't reached its Guard registers before we conclude zero.

- Focus: publish g_orig_proc before SetWindowLongPtr activates the subclass (and
  subclass_proc falls back to DefWindowProc if null); and disable the focus-query
  hooks in reverse install order, because GetForegroundWindow shares user32 code
  with GetActiveWindow (keep GFW hooked until GAW is unhooked).

- disable()/enable() [[nodiscard]] results are handled (logged), not (void)-discarded.

Storm now survives on every backend across repeated runs.

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

hook/src/xinput_hook.cpp

@@ -10,6 +10,7 @@
 #include <safetyhook.hpp>
 
 #include "hook_guard.hpp"
+#include "hook_install.hpp"
 #include "hook_registry.hpp"
 
 namespace coop::hook
@@ -174,7 +175,8 @@ void hook_export(HMODULE module, const char* name, void* detour, int registry_id
 	}
 	if (void* target = reinterpret_cast<void*>(GetProcAddress(module, name)))
 	{
-		g_hooks.emplace_back(safetyhook::create_inline(target, detour));
+		g_hooks.emplace_back();
+		install_inline(g_hooks.back(), target, detour); // assign-then-enable (no install race)
 		hook_set_installed(registry_id, true);
 	}
 }
@@ -187,7 +189,8 @@ void hook_ordinal(HMODULE module, WORD ordinal, void* detour, int registry_id)
 	}
 	if (void* target = reinterpret_cast<void*>(GetProcAddress(module, MAKEINTRESOURCEA(ordinal))))
 	{
-		g_hooks.emplace_back(safetyhook::create_inline(target, detour));
+		g_hooks.emplace_back();
+		install_inline(g_hooks.back(), target, detour); // assign-then-enable (no install race)
 		hook_set_installed(registry_id, true);
 	}
 }
@@ -240,7 +243,7 @@ void remove_xinput_hooks()
 	// rate could hit (the same class as the mock-game present-storm crash).
 	for (auto& h : g_hooks)
 	{
-		(void)h.disable();
+		disable_for_removal(h);
 	}
 	hook_set_installed(g_id_getstate, false);
 	hook_set_installed(g_id_getstateex, false);