docs(work): decompose binder-wrap-helper PRD into epic + 8 stories

Output from `pnpm work decompose 2026-05-13-binder-wrap-helper
--execute` — sandcastle ran the decomposer agent with subscription
auth (after the macOS keychain workaround + Dockerfile fix from
prior commits). The agent wrote files but hit `Max iterations: 1`
before committing, so this commit carries its output unchanged.

Epic: docs/work/binder-wrap-helper/
  - _epic.md links to PRD 2026-05-13-binder-wrap-helper
  - features: [core-shared, auth, blog, media, marketing-pages,
    navigation, tooling]

Stories (8 total, with dependency edges):
  01-wire-use-case-helper           prereq (blocks 02..07)
    Goal: helper at core-shared/conformance/wire-use-case.ts +
    tests covering brand stacking, span/capture/audit composition,
    idempotent bind. depends-on: [], blocks 02..07.
  02-migrate-auth-binders           depends-on [01]
  03-migrate-blog-binders           depends-on [01]
  04-migrate-media-binders          depends-on [01]
  05-migrate-marketing-pages-       depends-on [01]
    binders
  06-migrate-navigation-binders     depends-on [01]
  07-update-feature-generator       depends-on [01]
  08-holistic-validation            depends-on [02..07], blocks: []
    Final gate suite + fallow dupes check to verify the 5 binder-
    pair clone groups have disappeared.

After 01 lands, stories 02..07 are parallelisable; 08 collects them.

Pre-commit hook regenerates _state.json + re-stages it so `pnpm
work next` immediately surfaces the new ready story.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/work/binder-wrap-helper/_epic.md

@@ -0,0 +1,28 @@
+---
+id: binder-wrap-helper
+prd: 2026-05-13-binder-wrap-helper
+title: Collapse binder duplication via wireUseCase helper
+type: epic
+status: in-progress
+features: [core-shared, auth, blog, media, marketing-pages, navigation, tooling]
+created: 2026-05-13
+---
+
+## Goal
+
+Introduce a `wireUseCase(...)` helper in `@repo/core-shared/conformance/` that encapsulates the `withSpan + withCapture (+ optional withAudit)` composition, then migrate all five features' binder pairs to call it. Update the feature generator template so new features scaffold with the helper by default.
+
+## Why
+
+Five of `pnpm fallow`'s top-ten clone groups come from binder pairs. The inline wrapping is ~30–79 lines per binder pair, repeated identically across 10 files. Any change to the wrapping shape requires N × 2 simultaneous edits; forgetting one is silent drift.
+
+## Stories
+
+- [ ] [01 — wireUseCase helper + tests (core-shared)](01-wire-use-case-helper/_story.md)
+- [ ] [02 — Migrate auth binders](02-migrate-auth-binders/_story.md)
+- [ ] [03 — Migrate blog binders](03-migrate-blog-binders/_story.md)
+- [ ] [04 — Migrate media binders](04-migrate-media-binders/_story.md)
+- [ ] [05 — Migrate marketing-pages binders](05-migrate-marketing-pages-binders/_story.md)
+- [ ] [06 — Migrate navigation binders](06-migrate-navigation-binders/_story.md)
+- [ ] [07 — Update feature generator template](07-update-feature-generator/_story.md)
+- [ ] [08 — Holistic validation](08-holistic-validation/_story.md)