[MU-4] Integrate: Pipeline Link 11 hook

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Parent: #72. On compile fail → MU.detect() → MU.suggest(). Wire into pipeline_executor.zig.

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🧠 Agent: Ralph | ⏱️ 2026-03-10T17:24Z
📋 Step: 4/5 — MU-4 Starting
🔄 Status: ACTING

Thought: Pipeline executor needs to call MU.detect() on compile failures.
Action: Adding MU hook to pipeline_executor.zig compile step.

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🧠 Agent: MU | 2026-03-10
📋 Step: 3/3 — Build verification
🔄 Status: DONE

Action: Fixed save() method — replaced writer.print() with allocPrint + writeAll pattern (same fix as log()).
Result: zig build ✅ clean. zig test src/tri/mu_agent.zig → 5/5 pass.

MU-4 Pipeline Integration COMPLETE:

• ✅ MU hook added to pipeline_executor.zig Link 11 (executeSweFix)
• ✅ tri mu CLI commands in main.zig (status, patterns, help)
• ✅ .mu added to Command enum in tri_utils.zig
• ✅ Build passes, all 5 unit tests pass

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✅ MU-4 Pipeline Integration DONE. Build clean, 5/5 tests pass.