feat(woo): S4 Woo client + taxonomy sync + test-woo + admin taxonomy
- backend/woo.py: stdlib urllib Woo v3 client. Basic-auth, HTTPS-only, X-WP-TotalPages
pagination, typed errors (CredentialsMissing/Auth/NotFound/Server/Connection),
injectable transport for tests, WP core media upload.
- backend/taxonomy.py: sync pulls categories/tags/attributes/terms into cache in one
commit (rollback keeps prior cache on failure); fig-*/feat-* tag scoping; stable
taxonomy_anchor hash; get_cached grouped admin view.
- backend/app.py: POST /settings/test-woo (fail-closed, resync on success),
GET /admin/taxonomy, POST /admin/taxonomy/sync (502 on Woo failure).
- frontend: Settings Test Woo button + result display.
- tests: 8 woo/taxonomy tests (auth header, non-https refusal, pagination, missing
creds, 401, scoped sync, failure-keeps-cache, anchor stability).
Verified: pytest 31 passed; check_requirements + check_coverage exit 0; npm build ok;
live QA test-woo fail-closed + sync 502.
Ty
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