docs(work): re-decompose binder-wrap-helper into vertical-slice stories

Re-decomposes the approved binder-wrap-helper PRD after the previous
8-story attempt (dropped in 71c04f5) sliced horizontally — its
"write test" / "write impl" splits would have left intermediate
commits red. The new shape obeys slice = task = PR = commit:

- 01-wire-use-case-helper — 1 task: ship the wireUseCase helper
  (factory composition + container bind + brand stack) with its
  unit tests and barrel export in one green commit. Blocks 02 + 03.
- 02-migrate-feature-binders — 5 tasks, one per feature
  (auth, blog, media, marketing-pages, navigation). Each task
  migrates that feature's bind-production.ts + bind-dev-seed.ts
  together and keeps all gates green.
- 03-update-generator-templates — 1 task: update the feature
  generator's bind-*.hbs so future scaffolds emit wireUseCase
  directly instead of inline withSpan + withCapture.

Output of the now-fixed sandcastle decompose dispatch — depends on
the completionSignal + maxIterations wiring (eadbb7e, 26aa97f).

docs/work/2026-05-13-binder-wrap-helper/03-update-generator-templates/_story.md

@@ -0,0 +1,39 @@
+---
+id: 03-update-generator-templates
+epic: 2026-05-13-binder-wrap-helper
+title: Update feature generator templates to emit wireUseCase call shape
+type: technical-story
+status: todo
+feature: core-shared
+depends-on: [01-wire-use-case-helper]
+blocks: []
+---
+
+## Goal
+
+Update `turbo/generators/templates/feature/src/di/bind-production.ts.hbs` and `bind-dev-seed.ts.hbs` so that `pnpm turbo gen feature` scaffolds new features with `wireUseCase` calls instead of the longhand inline `withSpan + withCapture` form.
+
+## Why
+
+New features scaffolded after the migration would otherwise drift back to the inline form, re-introducing the clone group. The generator is the canonical source for scaffolded binder shape; updating it closes the loop.
+
+## Done when
+
+- `turbo/generators/templates/feature/src/di/bind-production.ts.hbs` emits `wireUseCase(...)` calls (not inline `withSpan + withCapture`) for the placeholder use case.
+- `turbo/generators/templates/feature/src/di/bind-dev-seed.ts.hbs` emits `wireUseCase(...)` calls for the placeholder use case.
+- Running `pnpm turbo gen feature testfeature` produces binder files that call `wireUseCase` and pass `pnpm typecheck && pnpm lint && pnpm test && pnpm conformance && pnpm fallow:audit && pnpm coverage:diff` (or the generated feature is cleaned up after verification).
+
+## In scope
+
+- `turbo/generators/templates/feature/src/di/bind-production.ts.hbs`
+- `turbo/generators/templates/feature/src/di/bind-dev-seed.ts.hbs`
+- Any supporting type imports in the templates that change as a result (e.g. dropping `ProductionUseCase` intermediate type if the helper absorbs it).
+
+## Out of scope
+
+- Generator templates for events, jobs, realtime, or core-packages — those do not produce binder files with use-case wrapping.
+- Runtime behaviour changes — the generated output must be semantically equivalent to the old inline form.
+
+## Tasks
+
+- [ ] Update `bind-production.ts.hbs` and `bind-dev-seed.ts.hbs` in `turbo/generators/templates/feature/src/di/` to emit `wireUseCase` calls; verify a test-scaffold of a new feature produces correct binder output and all gates pass on this commit.