chore: integrate AI development platform into HLL Vietnam project

ai/orchestrator/feature-planner.md

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+# Feature Planner
+
+## Purpose
+
+Turn explicit repository requests into implementation-ready tasks without expanding product scope.
+
+## Workflow
+
+1. Read `AGENTS.md`.
+2. Read `ai/repo-context.md`.
+3. Read `ai/architecture-index.md`.
+4. Inspect only the files directly related to the request.
+5. Create the smallest useful task set in `ai/tasks/pending`.
+
+## Rules
+
+- Use `ai/task-template.md`.
+- Keep tasks small, focused and verifiable.
+- Do not invent product work beyond the request.
+- Keep HLL Vietnam branding and stack constraints intact.