docs: teach the effect map, not the deleted submit method (RD-09)

RD-05 through RD-08 replaced the hand-called submit method with
createStore's effect map. Two teaching documents still showed the old
method in a code block, as the answer to "how does a submit happen?".
Both blocks also called a function that no longer exists.

Rewrite the code block in ARCHITECTURE.md section 2d and its
fp-tea-atomic-design.md counterpart. Both now show the effect map, keyed
on the Submitting tag, using the same herregistratie worked example with
its optimistic begin/confirm/rollback calls. Both use draftSync.submit,
the call the two herregistratie wizards make today.

State the two properties the old idiom lacked, since they are the reason
for the change: entering a state runs its effect, so a dispatch cannot
skip it; and double-submit protection is structural, because the effect
fires only on a tag transition. Add one sentence on the Seed exemption: a
mount or restore message must not trigger a submit.

Fix the one runIfSubmitting() hop in the write walkthrough at
ARCHITECTURE.md's line 574. The rest of section 6a stays stale on
purpose — RD-31 owns it, including its line citations and dead paths.
fp-tea-atomic-design.md's broken pre-monorepo paths stay stale too —
RD-32 owns those.

Set RD-09's Status to done and its README row to done in the same
commit.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/project/readable-codebase/README.md

@@ -103,7 +103,7 @@ two. Note that RD-15 exists because 22 abandoned agent worktrees are still on di
 | RD-06 | **Bug fix:** 2 single-step forms to the effect map + retry affordance        | 05         | yes       | done   |
 | RD-07 | Add `Primary` to the 3 wizard machines + specs                               | 05         |           | done   |
 | RD-08 | Migrate the 3 wizards to the effect map + `Primary`                          | 07         | yes       | done   |
-| RD-09 | **Docs + generator:** `form-machine.hbs`, ARCHITECTURE, fp-tea, skill        | 08         |           | todo   |
+| RD-09 | **Docs + generator:** `form-machine.hbs`, ARCHITECTURE, fp-tea, skill        | 08         |           | done   |
 | RD-10 | `WizardStatus` to a payload-carrying `WizardPhase`                           | 08         | yes       | todo   |
 | RD-11 | Fold the lifecycle projection into `remote-data.ts`; PascalCase 3 machines   | 01         |           | todo   |
 | RD-12 | `ActionState` becomes `action` on `BriefState.Loaded`                        | 11         |           | todo   |