chore: mark Phase 0 and Phase 1 tasks as completed

All six tasks are done:
- core/connection-credentials: ConnectionCredentials + RemoteIdentity in alknet-core
- tls/crate-init: alknet-tls crate skeleton with deps and feature flags
- tls/server-extract: server-side TLS code extracted into alknet-tls
- tls/client-extract: client-side TLS code extracted into alknet-tls
- tls/tests: 34 TLS tests moved and adapted into alknet-tls
- tls/review-tls: spec conformance review passed, all feature combos green

tasks/tls/review-tls.md

@@ -1,7 +1,7 @@
 ---
 id: tls/review-tls
 name: Review alknet-tls implementation for spec conformance, deduplication, and test coverage
-status: pending
+status: completed
 depends_on: [tls/tests]
 scope: moderate
 risk: low