Records the Plan 9 architectural decision (schemas in use-case file,
runtime output validation, presenter pattern, feature-scoped error
middleware, ./ui subpath split). ADR-012 gets a one-line cross-
reference to the new ADR. Refactor log gets a Summary section with
commit table and conformance checklist.
Plan 9 complete. The deferred doc-update pass (CLAUDE.md / AGENTS.md /
guides) — combined with the still-pending Plan 8 items — is the next
follow-up.
Refactor log: Summary, doc-update checklist
Spec: R29, R30
Danijel Martinek
36548942d4