docs: update ai docs plan

docs/planning/AI-Docs-Plan.md

@@ -42,13 +42,24 @@ The docs under docs/ai map 1:1 to Confluence pages.
   - planning/
     - AI-Docs-Plan.md
 
+## Assets (Non-Guide Content)
+Agent prompts and instruction files are stored under assets/ so they can be moved to a separate distribution repo later.
+
 ## Open Items
-- Add repo links for each skill in the Skills Library.
+- Add link to the central assets repo in Skills Library (single source of truth).
 - Add screenshots for setup flows.
 - Define section owners and review cadence.
 - Add platform-specific prompt examples.
 - Identify approved Android MCP tools and add details.
 
+## Doc Navigation Pattern (Required)
+When adding, removing, or renaming files under docs/ai:
+1. Update docs/ai/index.md
+2. Update the page breadcrumb ("You are here")
+3. Update the page Contents block
+4. Update the Next Steps block
+5. Verify links still resolve
+
 ## Risks
 - Docs drift as tools and plugins update.
 - Unclear ownership leads to stale content.