feat: MCP server v1.2.0 — guide system + read/write guide tools

Adds full guide system to MCP standalone server. System guides (schema,
creating-nodes, edges, dimensions, extract) are bundled and immutable.
Users can create up to 10 custom guides via rah_write_guide. Syncs guide
infrastructure from main repo to OS repo app code.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

apps/mcp-server-standalone/guides/preferences.md

@@ -0,0 +1,14 @@
+---
+name: Preferences
+description: Your communication style, workflow rules, and current priorities.
+---
+
+# Preferences
+
+Add your preferences here. The agent will read this guide to understand how you like to work.
+
+## Examples of what to put here
+- Communication style (bullet points vs prose, level of detail)
+- Workflow rules (always ask before creating dimensions, etc.)
+- Current priorities (what you're focused on this week)
+- Timezone and locale