Phase 36-37: TinyHotHeap v2 HotBox redesign and C7 current_page policy fixes

- Redefine TinyHotHeap v2 as per-thread Hot Box with clear boundaries
- Add comprehensive OS statistics tracking for SS allocations
- Implement route-based free handling for TinyHeap v2
- Add C6/C7 debugging and statistics improvements
- Update documentation with implementation guidelines and analysis
- Add new box headers for stats, routing, and front-end management

core/hakmem_tiny_init.inc

@@ -15,6 +15,9 @@ void hak_tiny_init(void) {
     // Step 1: Simple initialization (static global is already zero-initialized)
     g_tiny_initialized = 1;
 
+    // Route snapshot (TinyHeap vs Legacy) を起動時に固定
+    tiny_route_snapshot_init();
+
 
     // Reset fast-cache defaults and apply preset (if provided)
     tiny_config_reset_defaults();