Phase 1, Task 3 of crate extraction. Extracts client-side TLS setup code
from alknet-call/call_client.rs into alknet-tls:
- client.rs: TlsClientConfig, build_client_auth, select_server_verifier,
load_platform_root_cert_store, FingerprintPinVerifier,
RawKeyClientCertResolver, NoClientCertResolver
- load_platform_root_cert_store includes webpki-roots fallback (ADR-088 §5)
- Reuses shared Ed25519SigningKey from signing.rs and load_cert_chain/
load_private_key from pem.rs
- All error returns use TlsError (not String)
- webpki-roots 0.26 with TrustAnchor-based fallback
Old code in call_client.rs stays (duplicated). No breakage.
deepseek-v4-pro
effbd4174e