feat(harness): gate product routes with a UI-to-controller wiring manifest

Parent: #384 (P0-1c). Depends on P0-1a.

## Scope
Create a mechanical screen -> live adapter -> controller -> application-use-case manifest for product routes; preview routes may use mocks, product routes may not silently fall back.

## Acceptance
- Every governed product screen maps to real cross-layer targets or an explicit approved exception.
- Production-route mock fallback fails the check.
- Manifest drift against code fails CI.
- Start with the audited phase-01 routes without implementing product features in this issue.

Delivery discipline: one issue, one worker branch, one PR.

Start with the audited phase-01 product routes and the work from parent issue #384, checking the dependency on P0-1a. Trace each screen through its live adapter, controller, and application use case, then verify that production mock fallbacks and manifest drift fail the check while approved exceptions remain explicit.

Written by the indexing model from the issue text.