post
https://example.com/public-api/v1/phone_call_legs//comments
Add a new comment to a call-detail record.
The comment is attributed to the authenticated caller (the creator is
resolved from the request token). phone_call_leg_id is validated as
a UUID and the body against the request schema — a malformed id, a
blank/missing value, or an unknown field fails with
422 at request validation. An unknown call-detail returns 404.
Returns 201 with the created comment (id + timestamps).