Idempotent Group/Layer CRUD Tools#51

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bbible3 wants to merge 3 commits intoloonghao:mainfrom

bbible3:feat/robust-group-layer-crud

Commits on Mar 25, 2026

Fix active document layer reporting in session tool
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Add document layer tree tool with root layer coverage
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feat: robust, idempotent group/layer CRUD tools for MCP server\n\n- Add create_group (idempotent, parent support, returns existing if requested)\n- Add move_layer_to_group (robust, idempotent, erro…
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