feat(mcp): serve specialist guides on demand and shorten instructions

docs/automation/guides/architecture.md

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+# Architectural vectorization
+
+When converting or vectorizing a floorplan from an image or sketch:
+
+1. Attach reference images as Xref underlays via embed_image on layer _XREF and lock it.
+2. NEVER draw loose lines or arcs for doors or windows; always query records (collection: 'block_records') and insert Block References (type: 'INSERT') on A-DOOR and A-GLAZ. If a block is missing, draft standard geometry at origin (0,0) and register it with block_define before inserting.
+3. Categorize layers cleanly: A-WALL-EXTR, A-WALL-INTR, A-WALL-HATCH, A-DOOR, A-GLAZ, A-ANNO-TEXT, A-ANNO-DIMS.
+4. Always verify drafted geometry using ocs_capture with annotate: true (Set-of-Marks entity IDs) and diff: true (visual dirty streaming).