Phase 9: SuperSlab optimization & EMPTY slab recycling (WIP)

Phase 9-1: O(1) SuperSlab lookup optimization
- Created ss_addr_map_box: Hash table (8192 buckets) for O(1) SuperSlab lookup
- Created ss_tls_hint_box: TLS caching layer for SuperSlab hints
- Integrated hash table into registry (init, insert, remove, lookup)
- Modified hak_super_lookup() to use new hash table
- Expected: 50-80 cycles → 10-20 cycles (not verified - SuperSlab disabled by default)

Phase 9-2: EMPTY slab recycling implementation
- Created slab_recycling_box: SLAB_TRY_RECYCLE() macro following Box pattern
- Integrated into remote drain (superslab_slab.c)
- Integrated into TLS SLL drain (tls_sll_drain_box.h) with touched slab tracking
- Observable: Debug tracing via HAKMEM_SLAB_RECYCLE_TRACE
- Updated Makefile: Added new box objects to 3 build targets

Known Issues:
- SuperSlab registry exhaustion still occurs (unregistration not working)
- shared_pool_release_slab() may not be removing from g_super_reg[]
- Needs investigation before Phase 9-2 can be completed

Expected Impact (when fixed):
- Stage 1 hit rate: 0% → 80%
- shared_fail events: 4 → 0
- Kernel overhead: 55% → 15%
- Throughput: 16.5M → 25-30M ops/s (+50-80%)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

core/hakmem_tiny_lazy_init.inc.h

@@ -17,6 +17,7 @@
 #include <stdint.h>
 #include <stdio.h>  // For fprintf
 #include "superslab/superslab_types.h"  // For SuperSlabACEState
+#include "box/ss_addr_map_box.h"  // Phase 9-1: SuperSlab address map
 
 // ============================================================================
 // Phase 22-1: Per-Class Initialization State
@@ -135,6 +136,15 @@ static inline void lazy_init_global(void) {
         hak_super_registry_init();
         hak_ss_lru_init();
         hak_ss_prewarm_init();
+
+        // Phase 9-1: Initialize SuperSlab address map (hash table O(1) lookup)
+        ss_map_init(&g_ss_addr_map);
+
+#if !HAKMEM_BUILD_RELEASE
+        if (getenv("HAKMEM_SS_MAP_TRACE")) {
+            fprintf(stderr, "[SS_MAP] Initialized hash table with %d buckets\n", SS_MAP_HASH_SIZE);
+        }
+#endif
     }
 
     // Mark global resources as initialized