feat(trunk): TwilioCallControlClient (live REST impl behind twilio-live) + env parser (slice-5 T6)

The live Twilio call-control client. Originates outbound calls via Twilio's
Calls.json API (TwiML <Connect><Stream> instructs Twilio to fork audio back
to our /twilio/media-stream WSS endpoint); hangs up via Status=completed.
HTTP basic auth over HTTPS; auth_token is NEVER logged (ADR-0009 -- provider
credentials never reach the brain) -- tracing fields expose only caller-
controlled values (to, from) + the CallSid's last 4 chars.

Feature-gated behind `twilio-live` so the routine CI gate stays feature-
default-off: MockCallControlClient is the per-PR test surface; the maintainer
runs cargo test --features=twilio-live when validating a release. reqwest +
tracing + serde_json are optional deps (dep:foo syntax) -- pulled in only
when the feature is on, keeping the default resolve lean.

The env parser (config::twilio_credentials) follows slice-5/seams' pure-
function pattern: takes Option<String> inputs (testable without env mutation),
returns Ok(None) when all four RUTSTER_TWILIO_* vars are unset (WebRTC-only
mode), Ok(Some) when all four present + parse, Err on partial config (fail-
fast at startup) or malformed values. TwilioCredentials is imported by the
binary but never re-exported through the workspace (ADR-0009).

T6 of slice-5. Depends on T2 (TwilioCredentials + CallControlClient trait).

Signed-off-by: Aaron D. Lee <himself@adlee.work>
This commit is contained in:
2026-07-05 03:04:22 -04:00
committed by A.D.Lee
parent 0320ab5ce0
commit d19d772bd0
8 changed files with 859 additions and 12 deletions

416
Cargo.lock generated
View File

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name = "wit-bindgen"
version = "0.57.1"