generation 2: port identity types, fingerprint, pem + signing

port-identity-types (src/identity.rs):
- TlsIdentity (four variants), Ed25519SecretKey, AcmeDirectory ported
  verbatim from alknet-core config.rs; OQ-TLS-02 + server-only docs
  on the variants; 9 in-module tests incl. Debug-no-leak
- dep decision: rand_core 0.6 (+getrandom) with ed25519-dalek
  rand_core feature, NOT rand (lockfile rand 0.10/rand_core 0.10
  traits are incompatible with ed25519-dalek 2.2's CryptoRngCore);
  rand stays out of the tree entirely

port-fingerprint (src/fingerprint.rs):
- fingerprint_from_cert_der, extract_ed25519_raw_key_from_spki,
  DerParser ported verbatim; production code sha2 + manual DER
  (+hex for the normalized formats)
- 16 tests: 7 ported + 9 new malformed-DER edges (the extraction
  had none despite the invariant naming them)
- empty-input behavior: matches extraction's actual code (always
  Some via the SHA-256 fallback); doc records the deviation from
  the stale None claim

port-pem-signing (src/pem.rs, src/signing.rs):
- load_cert_chain/load_private_key remapped to TlsError::CertLoad
  per ADR-002; InvalidData no-key path kept
- Ed25519SigningKey rewired to crate::identity::Ed25519SecretKey
  (the one intentional change); rcgen PEM round-trip test added

lib.rs re-export block: fingerprint + pem + signing + identity lines
landed; server/client/credentials pending their port tasks

Verification: cargo test (36), cargo test --all-features (37),
clippy -D warnings (default+all-features), fmt --check, feature
checks (noq/tcp/acme) — all green

Cargo.toml

@@ -27,8 +27,10 @@ rustls-pemfile = "2"
 rustls-native-certs = "0.8"
 webpki-roots = "0.26"
 rcgen = "0.13"
-ed25519-dalek = "2"
+ed25519-dalek = { version = "2", features = ["rand_core"] }
+rand_core = { version = "0.6", features = ["getrandom"] }
 sha2 = "0.10"
+hex = "0.4"
 tracing = "0.1"
 thiserror = "2"