Host API v3; API v2-v3 accepted. Last verified: 2026-09-10.
- PROCESS_PLUGIN_PROTOCOL.md: process plugin message protocol and action schema.
- CANVAS_INTERACTION_PROTOCOL.md: Host API v3 interactive canvas input and overlay fusion.
- ADVANCED_COLOR_EDITOR_PLUGIN.md: advanced color editor capability contract.
- PLUGIN_TEMPLATE.md: minimal native plugin template.
Host extension points include ADS floating panels, canvas overlays and interactions,
panel workspaces, and single-undo host batch edits (buildBatchEdit). The native
Note Chain editor is part of the host and is not a process-plugin reference.
Project-wide documentation: ../../../docs/README.md. Runnable process-plugin payloads: ../../../plugins/samples/README.md.