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feat: add Primary message to the 3 wizard machines (RD-07)

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Each wizard component re-derives the step-boundary decision the reducer
already owns: advance on a middle step, submit on the last step. This
ticket moves that decision into the machine, so RD-08 can replace the
component's guard with one dispatch.

Add a `Primary` message to each Msg union, and export a `primary(s)`
function next to the existing `next`/`submit` pair. `primary` is a
three-line branch that delegates to `next`/`submit` and writes no new
validation. Each machine tests "last step" in its own vocabulary, per
the ticket's Decisions block: `herregistratie` checks `step === 3`,
`intake` checks `currentStep(s) === 'review'`, `registratie` checks
`currentStep(s) === 'controle'`. `Next` and `Submit` stay in every
union and every reducer — `Primary` is purely additive.

Add 3 spec cases per machine (9 total): Primary advances from a
non-final step, Primary submits from the final step, and Primary is a
no-op outside the editing state. Each case also asserts the
equivalence the ticket requires for RD-08's migration:
`reduce(s, Primary)` equals `reduce(s, Next)` at a non-final step, and
equals `reduce(s, Submit)` at the final step.

Regenerate `behaviour-spec.mdx` for the 9 new `it()` titles.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
eho
2026-09-04 17:06:02 +02:00
co-authored by Claude Sonnet 5
parent d9c56b0c24
commit be1fcb4b40
9 changed files with 273 additions and 2 deletions
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docs/project/readable-codebase/README.md
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@@ -101,7 +101,7 @@ two. Note that RD-15 exists because 22 abandoned agent worktrees are still on di
| RD-04 | Story titles to `Domein/<Context>/<Name>`; add the missing stories | 03 | yes | todo |
| RD-05 | `createStore` gains the effect map + specs | 02 | | done |
| 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 | | todo |
| 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 | todo |
| RD-09 | **Docs + generator:** `form-machine.hbs`, ARCHITECTURE, fp-tea, skill | 08 | | todo |
| RD-10 | `WizardStatus` to a payload-carrying `WizardPhase` | 08 | yes | todo |