Archive the three completed changes behind replace-mock-api-wave-1/2/3. Each
merge applied cleanly to the main specs:
- catalog gains the Public product browse requirement (subtree filtering and
price sort)
- frontend-mall picks up the per-domain adapter, the pinned home page, the
discovery-page changes, the live auth panels and the live transaction flows
- cart's Server-side cart requirement now documents the shop and stock carried
by every line
Also replace the TBD Purpose placeholder in all eleven specs with a one-line
description of what each capability covers. Those placeholders predate this
work and were the only reason `openspec validate --all --strict` reported
0 passed / 11 failed; it now reports 11 passed / 0 failed.
james
2136a48fbe