docs: bind canonical channel workspace

Authorized channel-skill migration; local package validation passed.

SKILL.md

@@ -376,3 +376,16 @@ Requires human approval for:
 - [ ] A successful unrequested completion report contains only substantive changes and documentation links; technical delivery evidence appears only on request or for an actionable exception.
 - [ ] When React Flow is used, its graph and semantic table share one canonical-YAML selector and pass accessibility, build, browser, and remote exact-head checks.
 - [ ] Completed work includes exact message, path, commit, URL, or run evidence.
+
+## Channel workspace standard
+
+Load `channel-workspace-organization` for channel setup, file placement, and authorized workspace migration. Canonical standard: https://gitea.lego-cloud.eu/global-skills/channel-workspace-organization . Follow that shared policy rather than duplicating it here. Existing workspace bindings below remain current until an authorized migration is completed and verified; this reference alone does not relocate files or change bindings.
+
+## Stage 2 channel workspace binding
+
+- Group: `skic-3darch`
+- Workspace: `/opt/data/channels/skic-3darch/channels/scope`
+- Immutable source channel: `1543925247361814568`
+- Mattermost channel: `8pbixgqd5tfa7cb1qxjeob7nya`
+- Board: unresolved in source binding; do not use a global board
+- Preserve existing purpose folders, channel authority, and historical evidence.