* coturn: 31 typed options including the 3 cert modes (acme/file/
selfsigned), the RFC2136 acme.sh sidecar config and challenge alias
subschema. coturn_static_auth_secret marked required.
* talk: 34 typed options covering the signaling/janus/nats triplet,
TURN integration, MCU (janus) tuning, trusted-proxy CIDRs and the
extra_hosts pin. talk_backend_secret, talk_turn_secret,
talk_session_hashkey and talk_session_blockkey marked required.
Both specs load cleanly through ansible-core's ArgumentSpecValidator,
have 100% defaults/spec coverage, and match the convention introduced
for the other roles in this collection.
Both new roles had 'vars file for httpbin' as the header comment in
vars/main.yml — copy-paste artefact from the httpbin role template.
Files are otherwise empty. Reviewer flagged both inline (PR review
comments 229 and 230).
