Refresh agent instruction files

.claude/rules/repo-boundary.md

@@ -1,9 +1,8 @@
-# Repo Boundary
+## Repo boundary
 
-Keep `markitect-tool` focused on provider-neutral markdown primitives:
-parse, validate, transform, compose, query, template, generate, configure,
-cache, and expose through CLI/API.
+This repo owns **markitect-tool** only. It does not own:
 
-Leave infospace lifecycle, persistence/orchestration, project-specific
-knowledge models, rendering applications, and service infrastructure to
-higher-layer repositories.
+<!-- TODO: List what belongs in adjacent repos, e.g.:
+- SSH key management → railiance-infra/
+- State hub code     → state-hub/
+-->