feat(core-004): JIT Compilation — multi-tier pipeline, 25 tests

jit_compilation.zig (1212 lines): 3-tier compilation pipeline
(Interpreter->Baseline->Optimizing), FunctionProfile with tier
promotion thresholds (100/10000 calls), CompilationQueue
priority-ordered (hot functions first), CodeCache LRU eviction,
BaselineCompiler for all 9 VSA ops (bind/unbind/bundle2/bundle3/
dot/cosine/hamming/permute/matvec), OptimizingCompiler (4-way
unrolling, fused single-pass cosine, branch-free matvec),
OSR on-stack replacement (500 loop iterations), deoptimization
with 3-retry limit, SpeedupAnalysis (5x baseline, 20x optimizing),
25 tests, build.zig wired (test-jit-compilation step).

Depends on: HW-001 (Hardware Abstraction Layer)
Tech tree: 51/56 (91%), Core branch: 4/4 (100%)

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

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

Author: gHashTag

.ralph/TECH_TREE.md

@@ -97,7 +97,7 @@
 ## 🔒 Locked (waiting for dependencies)
 | ID | Name | Branch | Needs (missing) |
 |----|------|--------|----------------|
-|CORE-004|JIT Compilation|core|HW-001 ✅ — **UNLOCKED**|
+
 |INF-005|Speculative Decoding v2|inference|INF-003 ❌, INF-004 ❌|
 |OPT-003|Weight Streaming|optimization|OPT-002 ❌|
 |DEP-004|Multi-Region Replication|deployment|DEP-003 ❌|
@@ -106,7 +106,7 @@
 ## 📊 Branch Progress
 | Branch | Done | Total | % |
 |--------|------|-------|---|
-|Core|3|4|75%|
+|**Core**|**4**|**4**|**100%**|
 |**Inference**|**4**|**5**|**80%**|
 |Deployment|2|4|50%|
 |**Optimization**|**16**|**16**|**100%**|
@@ -117,12 +117,12 @@
 |Visualization|1|1|100%|
 |**Nexus**|**10**|**10**|**100%**|
 |Multilingual|3|3|100%|
-|**Total**|**50**|**56**|**89%**|
+|**Total**|**51**|**56**|**91%**|
 
 ## 🎯 Recommended Next (highest ROI)
-1. **CORE-004** JIT Compilation — HW-001 ✅ UNLOCKED, provides 500% execution speed
-2. **HW-003** FPGA Acceleration — HW-001 ✅ UNLOCKED, native ternary hardware
-3. **DEP-001** Docker Container — portable deployment, enables CI testing
+1. **HW-003** FPGA Acceleration — HW-001 ✅ UNLOCKED, native ternary hardware
+2. **DEP-001** Docker Container — portable deployment, enables CI testing
+3. **DEP-003** Auto-Scaling — elastic infrastructure, prerequisite for DEP-004
 
 ---
 φ² + 1/φ² = 3 | TRINITY

build.zig

@@ -1908,4 +1908,17 @@ pub fn build(b: *std.Build) void {
     const gen_hw_abs_step = b.step("test-hardware-abstraction", "Test HW-001 Hardware Abstraction Layer — unified ternary backend");
     gen_hw_abs_step.dependOn(&run_gen_hw_abs_tests.step);
     test_step.dependOn(&run_gen_hw_abs_tests.step);
+
+    // Generated JIT Compilation tests (CORE-004: Multi-tier JIT pipeline)
+    const gen_jit_comp_tests = b.addTest(.{
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("generated/jit_compilation.zig"),
+            .target = target,
+            .optimize = optimize,
+        }),
+    });
+    const run_gen_jit_comp_tests = b.addRunArtifact(gen_jit_comp_tests);
+    const gen_jit_comp_step = b.step("test-jit-compilation", "Test CORE-004 JIT Compilation — multi-tier pipeline");
+    gen_jit_comp_step.dependOn(&run_gen_jit_comp_tests.step);
+    test_step.dependOn(&run_gen_jit_comp_tests.step);
 }