Mark recap Case-B design retrofit done; log cleanup-execution learnings

- Flip recap's Case-B /design backfill from "in flight" -> done in
  ROADMAP/AGENTS: contract extracted + two-phase conformance cleanup
  shipped (recap app 0.2.161).
- Add three cleanup-execution Field notes to guides/design.md:
  CSS-value-position var-ify scoping, exclude standalone no-:root
  exports, border-radius-clamp capsule snapping.
- Note the standalone-export literal-hex exception in design-checker.md's
  Color dimension.

ROADMAP.md

@@ -155,10 +155,13 @@ front-end, never a dependency.
 
 **Remaining options:** (a) `/retrofit` should backfill `design/` into existing user-facing
 repos (keysat, recap, recaps.cc, premier-gunner, ten31-database, ten31-transcripts) — run
-`/design` then `design-checker` per repo. **In flight:** recap is the first **Case B (Extract)**
-backfill — document-as-is, run in a recap session; it's the live test of the extract→reconcile
-path (previously untested — keysat was Case A/Import) and the source of the next Phase-D
-learnings for `guides/design.md`. (b) fold a `design-checker` pass into `/full-eval`
+`/design` then `design-checker` per repo. **Done (recap, 2026-06-17):** recap was the first
+**Case B (Extract)** backfill — document-as-is. It validated the extract→reconcile path
+(previously untested — keysat was Case A/Import); the contract was distilled and the
+conformance cleanup shipped in two phases (recap app 0.2.161). Extract-phase Phase-D learnings
+landed in `guides/design.md` (commit `9031281`); cleanup-execution learnings are now in
+`guides/design-checker.md`. **Remaining backfill repos:** recaps.cc, premier-gunner,
+ten31-database, ten31-transcripts. (b) fold a `design-checker` pass into `/full-eval`
 for repos that have a contract; (c) confirm against a real Claude Design run what the export
 bundle actually contains and tune the Phase C distillation (the export internals are only
 medium-confidence from research) — kept **decoupled** from the recap run so one untested thing