Thin CONTENT_ROOT content plane (ADR-0003/0004) with space visual field,
product UI for Title/Abstract/Visual, page list sidebar, and tests. Update
capability model and smoke checklist; mark WP-0006 finished.
Persist capability/feature vocabulary, v0 model, and founder stage-1 must set
(onboarding, spaces/pages with Title/Abstract/Visual, page copy and transfer).
Mark CSOC-WP-0001-T03 done; add CSOC-WP-0006 for implementation.
