Harden AI agent rules and compile learning workflow

docs/00-governance/compile_guardrails.md

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+# Compile Guardrails
+**Last Updated:** 2026-04-05
+
+Preventive rules to reduce repeat compile failures.
+
+## Core Prevention Rules
+- [ ] Verify NT8 signatures in official docs before adding/changing any `protected override`.
+- [ ] Keep NinjaScript edits within task scope and allowed file boundaries.
+- [ ] Enforce C# 5.0 syntax only; reject C# 6+ constructs.
+- [ ] Keep managed order sequence correct (stop/target before entry on same bar).
+- [ ] Guard `OnBarUpdate` by `BarsInProgress` and bar readiness.
+- [ ] Do not use unsupported attributes/types/enums without confirmation.
+
+## Verification Gates
+- [ ] Run `.\verify-build.bat` after changes.
+- [ ] Run focused tests for changed area.
+- [ ] If NinjaScript touched, compile in NT8 NinjaScript Editor.
+
+## Update Rule
+- [ ] Add a new guardrail entry whenever a compile issue reveals a missing prevention rule.