chore: integrate AI development platform into HLL Vietnam project

ai/orchestrator/repo-reviewer.md

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+# Repository Reviewer
+
+## Purpose
+
+Review repository health and identify only the most relevant technical follow-ups.
+
+## Rules
+
+- Start from `ai/architecture-index.md` and `ai/repo-context.md`.
+- Prefer documentation, consistency and workflow issues over speculative product work.
+- Do not create a large backlog by default.
+- If needed, create only minimal technical readiness tasks.