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/02-migrate-feature-binders/_story.md

@@ -0,0 +1,48 @@
+---
+id: 02-migrate-feature-binders
+epic: 2026-05-13-binder-wrap-helper
+title: Migrate all five feature binders to wireUseCase
+type: technical-story
+status: todo
+feature: auth, blog, media, marketing-pages, navigation
+depends-on: [01-wire-use-case-helper]
+blocks: []
+---
+
+## Goal
+
+Replace every inline `withSpan + withCapture (+ withAudit)` block in each feature's `bind-production.ts` and `bind-dev-seed.ts` with a call to `wireUseCase`. Existing binder-level and integration tests must continue to pass unchanged. Each feature migrates in its own commit.
+
+## Why
+
+The five inline wrapping clone groups are the top source of duplication reported by `pnpm fallow`. Moving to `wireUseCase` eliminates all five clone groups and leaves each binder as decision content only (which adapter, which mode, which symbol).
+
+## Done when
+
+- All 10 binder files (`auth ×2`, `blog ×2`, `media ×2`, `marketing-pages ×2`, `navigation ×2`) call `wireUseCase` for every use case binding; no inline `withSpan + withCapture` blocks remain for use cases.
+- `assertFeatureConformance` at the tail of each `bind-production.ts` continues to accept all wired use cases (brands present, manifest entries match).
+- `pnpm typecheck && pnpm test && pnpm lint && pnpm conformance && pnpm fallow:audit && pnpm coverage:diff` pass after each per-feature commit.
+- `pnpm fallow dupes` no longer shows the five binder-pair clone groups in its output.
+
+## In scope
+
+- `packages/auth/src/di/bind-production.ts` + `bind-dev-seed.ts` — 3 use cases (signIn, signUp, signOut).
+- `packages/blog/src/di/bind-production.ts` + `bind-dev-seed.ts` — 3 use cases (getArticles, getArticleBySlug, createArticle).
+- `packages/media/src/di/bind-production.ts` + `bind-dev-seed.ts` — 3 use cases (getMedia, listMedia, deleteMedia).
+- `packages/marketing-pages/src/di/bind-production.ts` + `bind-dev-seed.ts` — 2 use cases (getPageBySlug, getSiteSettings).
+- `packages/navigation/src/di/bind-production.ts` + `bind-dev-seed.ts` — 1 use case (getHeader).
+- If any binder's existing tests assert on internal wrapping shape rather than observable behaviour, refactor those assertions to test through the helper's contract (same commit as the binder change).
+
+## Out of scope
+
+- Controller bindings — covered by the helper per the PRD but deferred to a follow-up if scope is a concern.
+- Repository and service bindings — stay as direct `.toConstantValue()` calls.
+- Apps' `bindAll()` dispatcher — untouched.
+
+## Tasks
+
+- [ ] Migrate `auth` binders (`bind-production.ts` + `bind-dev-seed.ts`) to `wireUseCase` for all 3 use cases (signIn, signUp, signOut); all gates pass on this commit.
+- [ ] Migrate `blog` binders to `wireUseCase` for all 3 use cases (getArticles, getArticleBySlug, createArticle); all gates pass on this commit.
+- [ ] Migrate `media` binders to `wireUseCase` for all 3 use cases (getMedia, listMedia, deleteMedia); all gates pass on this commit.
+- [ ] Migrate `marketing-pages` binders to `wireUseCase` for both use cases (getPageBySlug, getSiteSettings); all gates pass on this commit.
+- [ ] Migrate `navigation` binders to `wireUseCase` for the single use case (getHeader); all gates pass on this commit; verify `pnpm fallow dupes` no longer surfaces the five binder-pair clone groups.