Add operational runbooks and decisions stub

docs/02-runbooks/compile_error_triage_workflow.md

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+# Compile Error Triage Workflow
+
+## Purpose
+Resolve compile errors quickly using smallest-safe changes and durable prevention notes.
+
+## Inputs
+- Failing command output (`./verify-build.bat` or `dotnet test`).
+- File scope constraints for current task.
+
+## Steps
+1. Reproduce with the same command to confirm current error set.
+2. Classify each error:
+   - missing type/namespace,
+   - bad override/signature,
+   - wrong overload/argument,
+   - C# 5.0 compatibility violation.
+3. Verify any NinjaScript/API signatures against NT8 docs before editing.
+4. Apply minimum-diff fix in scoped files only.
+5. Re-run `./verify-build.bat`.
+6. Run focused tests for the impacted area.
+7. If issue is non-trivial, add concise prevention notes to governance docs.
+
+## Required Output
+- Error-to-fix mapping (error code, root cause, fix).
+- Verification evidence (build/test commands and results).
+
+## Exit Criteria
+- Build passes.
+- Relevant tests pass.
+- Non-trivial learnings are captured.