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>

src/config/guides/system/edges.md

@@ -0,0 +1,51 @@
+---
+name: Edges
+description: Edge philosophy. Explanations, direction, types. Connection patterns.
+immutable: true
+---
+
+# Edges
+
+## Philosophy
+
+Edges are the most valuable part of the knowledge graph. Individual nodes are useful; the web of connections between them is what makes the graph powerful.
+
+## Rules
+
+1. **Every edge needs an explanation** — why does this connection exist? Be specific.
+2. **Direction matters** — FROM → TO should read like a sentence
+3. **Types are inferred** — the system infers category/type from your explanation. Don't set types manually.
+
+## Direction Convention
+
+Write the explanation so FROM → TO reads naturally:
+- Episode → Podcast: "Episode of this podcast"
+- Book → Author: "Written by this author"
+- Insight → Source: "Extracted from this source"
+- Idea → Related idea: "Builds on this concept"
+
+## Edge Context JSON
+
+```json
+{
+  "explanation": "Human-readable reason",
+  "category": "inferred (created_by, features, part_of, source_of, related_to)",
+  "type": "inferred specific type",
+  "confidence": 0.0-1.0,
+  "created_via": "chat|mcp|workflow"
+}
+```
+
+## Hub Traversal
+
+Hub nodes (most-connected) are the user's core themes. To understand context around a topic:
+1. Find the relevant hub node
+2. Use `queryEdge` or sqliteQuery to get its connections
+3. Traverse outward to related nodes
+
+## When to Create Edges
+
+- After creating synthesis/idea nodes (connect to sources)
+- When user mentions a relationship between topics
+- When running the Connect or Integrate guides
+- When obvious connections exist that aren't captured