new advisories work and features gaps work

docs/modules/binary-index/semantic-diffing.md

@@ -113,19 +113,51 @@ Semantic diffing is an advanced binary analysis capability that detects function
 
 ### Phase 1: IR-Level Semantic Analysis (Foundation)
 
-**Sprint:** `SPRINT_20260105_001_001_BINDEX_semdiff_ir_semantics.md`
+**Sprints:**
+- `SPRINT_20260105_001_001_BINDEX_semdiff_ir_semantics.md`
+- `SPRINT_20260112_004_BINIDX_b2r2_lowuir_perf_cache.md` (Performance & Ops)
 
 Leverage B2R2's Intermediate Representation (IR) for semantic-level function comparison.
 
 **Key Components:**
-- `IrLiftingService` - Lift instructions to LowUIR
+- `B2R2LowUirLiftingService` - Lifts instructions to B2R2 LowUIR, maps to Stella IR model
+- `B2R2LifterPool` - Bounded pool with warm preload for lifter reuse
+- `FunctionIrCacheService` - Valkey-backed cache for semantic fingerprints
 - `SemanticGraphExtractor` - Build Key-Semantics Graph (KSG)
 - `WeisfeilerLehmanHasher` - Graph fingerprinting
 - `SemanticMatcher` - Semantic similarity scoring
 
+**B2R2LowUirLiftingService Implementation:**
+- Supports Intel, ARM, MIPS, RISC-V, PowerPC, SPARC, SH4, AVR, EVM
+- Maps B2R2 LowUIR statements to `IrStatement` model
+- Applies SSA numbering to temporary registers
+- Deterministic block ordering (by entry address)
+- InvariantCulture formatting throughout
+
+**B2R2LifterPool Implementation:**
+- Bounded per-ISA pooling (default 4 lifters/ISA)
+- Warm preload at startup for common ISAs
+- Per-ISA stats (pooled, active, max)
+- Automatic return on dispose
+
+**FunctionIrCacheService Implementation:**
+- Cache key: `(isa, b2r2_version, normalization_recipe, canonical_ir_hash)`
+- Valkey as hot cache (default 4h TTL)
+- PostgreSQL persistence for fingerprint records
+- Hit/miss/eviction statistics
+
+**Ops Endpoints:**
+- `GET /api/v1/ops/binaryindex/health` - Lifter warmness, cache status
+- `POST /api/v1/ops/binaryindex/bench/run` - Benchmark latency
+- `GET /api/v1/ops/binaryindex/cache` - Cache statistics
+- `GET /api/v1/ops/binaryindex/config` - Effective configuration
+
 **Deliverables:**
 - `StellaOps.BinaryIndex.Semantic` library
-- 20 tasks, ~3 weeks
+- `StellaOps.BinaryIndex.Disassembly.B2R2` (LowUIR adapter, lifter pool)
+- `StellaOps.BinaryIndex.Cache` (function IR cache)
+- BinaryIndexOpsController
+- 20+ tasks, ~3 weeks
 
 ### Phase 2: Function Behavior Corpus (Scale)