feat(fp): WP-05 — parse-don't-validate closure + MDX

Close the three remaining unvalidated `as <DomainType>` casts at the wire
boundary (intake-policy, big-register aantekening type, brief passage scope),
each replaced by a Result-returning parser with a rejection-case spec, plus
the Foundations/Parse, don't validate curriculum page.

docs/backlog/README.md

@@ -44,7 +44,7 @@ for its existing violations, so every WP ends green.
 | [WP-02](WP-02-check-tokens.md)          | Harden `check:tokens` + fix what it catches                  | 0 · gates                   | done   |
 | [WP-03](WP-03-contracts-purity.md)      | Boundaries I: contracts purity + ApiClient confinement       | 0 · gates                   | done   |
 | [WP-04](WP-04-ui-not-infrastructure.md) | Boundaries II: `ui ↛ infrastructure` + showcase sanction     | 0 · gates                   | done   |
-| [WP-05](WP-05-parse-boundaries.md)      | Parse-don't-validate closure + MDX                           | 1 · FP/DDD                  | todo   |
+| [WP-05](WP-05-parse-boundaries.md)      | Parse-don't-validate closure + MDX                           | 1 · FP/DDD                  | done   |
 | [WP-06](WP-06-typed-async.md)           | Generic async template contexts — kill `$any()`              | 1 · FP/DDD                  | todo   |
 | [WP-07](WP-07-brief-idioms.md)          | Brief on the shared idioms + RemoteData MDX                  | 1 · FP/DDD                  | todo   |
 | [WP-08](WP-08-store-idiom.md)           | One store idiom + machine naming + TEA MDX                   | 1 · FP/DDD                  | todo   |

docs/backlog/WP-05-parse-boundaries.md

@@ -1,6 +1,6 @@
 # WP-05 — Parse-don't-validate closure + MDX
 
-Status: todo
+Status: done
 Phase: 1 — FP/DDD core
 
 ## Why
@@ -45,10 +45,10 @@ PassageScope` → validated parse (the file is otherwise parse-heavy; this one f
 
 ## Acceptance criteria
 
-- [ ] No unvalidated `as <DomainType>` casts in `**/infrastructure/**` (the sanctioned
+- [x] No unvalidated `as <DomainType>` casts in `**/infrastructure/**` (the sanctioned
       "narrow unknown to `Partial<Dto>` then parse" entry-cast is fine).
-- [ ] Each new parser has a spec including a rejection case.
-- [ ] MDX renders under Foundations in Storybook.
+- [x] Each new parser has a spec including a rejection case.
+- [x] MDX renders under Foundations in Storybook.
 
 ## Verification