Separate map projects and add reusable island and operator camera tools

docs/DECORATION.md

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+# Decoration workflow
+
+Decoration uses the ordinary checked building tools. A design recipe is a specification to translate into geometry; it is not an additional MCP tool. Keep building-specific palettes, coordinates, references and construction records in the map project.
+
+1. Read `project_context` and inspect the relevant part of the world. Establish the room's purpose, main silhouette and clear routes before adding detail.
+2. Choose a coherent palette. Use `material_search` for focused discovery and `material_describe` for a few exact defaults and property domains; reuse them while the catalog version is unchanged. See [material discovery](MATERIALS.md).
+3. Build one small prototype. Check proportions, supports, orientation and daylight appearance before repeating its motif. Leave calm surfaces between focal details and use texture variation in deliberate patches.
+4. Preserve entrances, circulation, sightlines and unfinished-space closures. Thin decorative blocks do not prove containment. Doors, beds and tall plants need all their component blocks; leaves usually need `persistent=true`.
+5. For an open trapdoor, choose the physical panel edge first: the panel occupies the edge **opposite `facing`**, with a thickness of 3/16 block. Check that it touches the intended support instead of leaving a 13/16-block gap. Horizontal lids use `half`; already correct panels must not be globally inverted.
+6. Apply bounded plans with fresh expected states, including `snapshot_id` for existing block entities. Stop on conflicts and preserve manual changes. Use checked undo when a completed detail needs to be removed.
+7. Inspect actual Minecraft captures from player height and an overview; check night lighting when relevant. State which views remain unverified. A matching block-state list does not establish good lighting or physical panel contact.
+
+The short shared instructions live in [building-guidance.ts](../bridge/src/building-guidance.ts). They are supplied to MCP and ACP clients without loading an entire recipe library into every turn. External map documents are not implicitly accessible to the in-game ACP agent.