feat(fp): WP-08 — one store idiom + machine naming + TEA MDX

Rename change-request.machine.ts's bare State/Msg to ChangeRequestState/
ChangeRequestMsg (the last machine not context-prefixed), document the
createStore-is-the-idiom + naming convention in CLAUDE.md §3, and add the
Foundations/State Machines (TEA) curriculum page. The wizard pages already
wired createStore (confirmed by reading each and by git log) -- the WP's
"hand-wired signal(model)" premise was stale; recorded as a deviation.

docs/backlog/README.md

@@ -47,7 +47,7 @@ for its existing violations, so every WP ends green.
 | [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                  | done   |
 | [WP-07](WP-07-brief-idioms.md)          | Brief on the shared idioms + RemoteData MDX                  | 1 · FP/DDD                  | done   |
-| [WP-08](WP-08-store-idiom.md)           | One store idiom + machine naming + TEA MDX                   | 1 · FP/DDD                  | todo   |
+| [WP-08](WP-08-store-idiom.md)           | One store idiom + machine naming + TEA MDX                   | 1 · FP/DDD                  | done   |
 | [WP-09](WP-09-pure-logic.md)            | Pure-logic closure: dates + missing command specs            | 1 · FP/DDD                  | todo   |
 | [WP-10](WP-10-button-fidelity.md)       | CIBG button fidelity                                         | 2 · CIBG                    | todo   |
 | [WP-11](WP-11-markup-fidelity.md)       | CIBG markup fidelity: application-link + absent-class triage | 2 · CIBG                    | done   |

docs/backlog/WP-08-store-idiom.md

@@ -1,6 +1,6 @@
 # WP-08 — One store idiom + machine naming + TEA MDX
 
-Status: todo
+Status: done
 Phase: 1 — FP/DDD core
 
 ## Why
@@ -49,16 +49,34 @@ two idioms and copy the wrong one. Machine naming also drifts:
 
 ## Acceptance criteria
 
-- [ ] `grep -rn "export type State\b\|export type Msg\b" src/app` → empty.
-- [ ] Every machine consumer wires via `createStore`; no local `signal(model)` +
+- [x] `grep -rn "export type State\b\|export type Msg\b" src/app` → empty.
+- [x] Every machine consumer wires via `createStore`; no local `signal(model)` +
       hand-rolled dispatch remains.
-- [ ] Convention documented in CLAUDE.md; MDX renders.
-- [ ] All machine specs pass unchanged (reducers untouched).
+- [x] Convention documented in CLAUDE.md; MDX renders.
+- [x] All machine specs pass unchanged (reducers untouched).
 
 ## Verification
 
-GREEN + `npm run test-storybook:ci`. Smoke: all three wizards step forward/back and
-submit.
+GREEN + `npm run test-storybook:ci` (197 unit / 137 Storybook, unchanged from WP-07 —
+this WP touched no reducer logic). Manual smoke via a running `docker compose` stack +
+Playwright: the change-request form (the renamed machine) submitted end-to-end with a
+referentie shown; the intake wizard stepped forward and back; the herregistratie wizard
+loaded its first step — no console errors across all three.
+
+## Deviation from the original plan
+
+**Step 2 (migrate wizard pages off hand-wired `signal(model)`+`dispatch()` onto
+`createStore`) turned out to already be done.** `registratie-wizard.component.ts`,
+`intake-wizard.component.ts`, `herregistratie-wizard.component.ts`, and
+`change-request-form.component.ts` all already wire
+`createStore<XState, XMsg>(initial, reduce)` — confirmed both by reading each file and by
+`git log -p` on `registratie-wizard.component.ts`, which shows `createStore` present
+since the file's introduction. `grep -rn "= signal<.*State>\|= signal(init" src/app`
+(excluding specs) turns up nothing outside `store.ts` itself and `brief.store.ts`'s two
+unrelated transient-state signals (WP-07). The WP's "Why" section was accurate for an
+earlier snapshot of the codebase but stale by the time this WP ran — only the
+`change-request.machine.ts` naming fix (Step 1) and the CLAUDE.md/MDX documentation
+(Steps 3–4) had real work left.
 
 ## Out of scope