Backport conformance CI pipeline from main branch with v1.x adaptations:
- Add v1.x to push/PR branch triggers, add workflow_dispatch
- Remove continue-on-error from both jobs
- Align server and client conformance package versions to 0.1.13
- Adapt client.py for v1.x API differences (3-tuple transport,
  RequestContext type, camelCase field names)
- Add expected-failures baseline for auth/resource-mismatch (needs
  RFC 8707 resource validation backport from main)

Server conformance: 40/40 passing
Client conformance: 262/263 passing (baseline clean)