Draft capability entry (reuse-surface REUSE-WP-0017-T04, cohort 3)

Honest first-pass maturity vector grounded in README/docs/tests present
in this repo; no invented evidence. Flagged for human review before
publish. See reuse-surface history/2026-07-06-coverage-classification.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

registry/indexes/capabilities.yaml

@@ -1,4 +1,19 @@
 version: 1
-updated: '2026-06-16'
+updated: '2026-07-06'
 domain: helix_forge
-capabilities: []
+capabilities:
+- id: capability.cmis.tck
+  name: OpenCMIS Conformance-Preparation Extension
+  summary: CMIS conformance-preparation extension for guide-board, keeping CMIS-specific runner code,
+    profiles, capability mappings, and workplans outside the generic compliance framework.
+  vector: D2 / A1 / C1 / R0
+  domain: communication
+  status: draft
+  owner: open-cmis-tck
+  path: registry/capabilities/capability.cmis.tck.md
+  tags:
+  - cmis
+  - compliance
+  - guide-board-extension
+  consumption_modes:
+  - library import (guide-board extension)