feat: Real VSA Modality Encoders — Cycle 51

4 encoder modules with @import("vsa") calling real VSA operations:
- vsa_real_text_encoder: 16 tests, 38 vsa.* calls
- vsa_real_vision_encoder: 15 tests, 38 vsa.* calls
- vsa_real_voice_encoder: 15 tests, 38 vsa.* calls
- vsa_real_code_encoder: 16 tests, 42 vsa.* calls

Re-applied 0.13 compat fixes (page_size, CallingConvention).
Updated build_zig13.zig with all encoder test steps.

zig build test: 809/809 tests, 25/25 steps.
Total real vsa.* calls across all generated modules: 290.

Co-authored-by: Ona <no-reply@ona.com>

Author: gHashTag

build_zig13.zig

@@ -204,6 +204,24 @@ pub fn build(b: *std.Build) void {
     vsa_imported_step.dependOn(&run_vsa_imported.step);
     test_step.dependOn(&run_vsa_imported.step);
 
+    // Real VSA Encoder tests (Cycle 51)
+    const encoder_files = [_][]const u8{
+        "generated/vsa_real_text_encoder.zig",
+        "generated/vsa_real_vision_encoder.zig",
+        "generated/vsa_real_voice_encoder.zig",
+        "generated/vsa_real_code_encoder.zig",
+    };
+    for (encoder_files) |enc_file| {
+        const enc_tests = b.addTest(.{
+            .root_source_file = b.path(enc_file),
+            .target = target,
+            .optimize = optimize,
+        });
+        enc_tests.root_module.addImport("vsa", vsa_mod);
+        const run_enc = b.addRunArtifact(enc_tests);
+        test_step.dependOn(&run_enc.step);
+    }
+
     // VIBEE Compiler CLI
     const vibee = b.addExecutable(.{
         .name = "vibee",

docs/golden_chain_cycle51_report.md

@@ -0,0 +1,56 @@
+# Golden Chain Cycle 51: Real VSA Modality Encoders
+
+**Date:** 2026-02-07
+**Status:** Complete
+**Build:** 809/809 tests, 25/25 steps
+
+## Summary
+
+Migrated all 4 modality encoders to use real `@import("vsa")` with actual VSA operations. Each encoder calls `vsa.bind()`, `vsa.bundle2()`, `vsa.permute()`, `vsa.cosineSimilarity()`, `vsa.charToVector()`, `vsa.encodeText()`, and `vsa.randomVector()` on real `HybridBigInt` vectors.
+
+Also re-applied Zig 0.13 compatibility fixes (`page_size_min` -> `page_size`, `callconv(.c)` -> `callconv(.C)`) that were overwritten by remote commits.
+
+## Encoder Modules
+
+| Module | Tests | Real vsa.* calls | Lines |
+|--------|-------|-------------------|-------|
+| vsa_real_text_encoder.zig | 16 | 38 | 366 |
+| vsa_real_vision_encoder.zig | 15 | 38 | 357 |
+| vsa_real_voice_encoder.zig | 15 | 38 | 360 |
+| vsa_real_code_encoder.zig | 16 | 42 | 373 |
+| **Total** | **62** | **156** | **1456** |
+
+## Build Results
+
+```
+Build Summary: 25/25 steps succeeded; 809/809 tests passed
+```
+
+| Step | Tests |
+|------|-------|
+| trinity.zig | 211 |
+| vsa.zig | 137 |
+| vm.zig | 187 |
+| b2t_integration | 23 |
+| wasm_parser | 27 |
+| extension_wasm | 31 |
+| depin | 5 |
+| vsa_imported_system | 126 |
+| vsa_real_text_encoder | 16 |
+| vsa_real_vision_encoder | 15 |
+| vsa_real_voice_encoder | 15 |
+| vsa_real_code_encoder | 16 |
+
+## Metrics
+
+| Metric | Value |
+|--------|-------|
+| New encoder tests | 62 |
+| New real vsa.* calls | 156 |
+| Total real vsa.* calls (all modules) | 290 (134 + 156) |
+| Build steps | 25/25 |
+| Total tests | 809/809 |
+| TODOs | 0 |
+
+---
+**Formula:** phi^2 + 1/phi^2 = 3