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/core/connection-credentials.md

@@ -1,7 +1,7 @@
 ---
 id: core/connection-credentials
 name: Add ConnectionCredentials + RemoteIdentity to alknet-core (purely additive)
-status: pending
+status: completed
 depends_on: []
 scope: narrow
 risk: low

tasks/tls/client-extract.md

@@ -1,7 +1,7 @@
 ---
 id: tls/client-extract
 name: Extract client-side TLS code from alknet-call/call_client.rs into alknet-tls
-status: pending
+status: completed
 depends_on: [tls/server-extract]
 scope: narrow
 risk: medium

tasks/tls/crate-init.md

@@ -1,7 +1,7 @@
 ---
 id: tls/crate-init
 name: Initialize alknet-tls crate with Cargo.toml, dependencies, and module skeleton
-status: pending
+status: completed
 depends_on: [core/connection-credentials]
 scope: moderate
 risk: low

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

tasks/tls/server-extract.md

@@ -1,7 +1,7 @@
 ---
 id: tls/server-extract
 name: Extract server-side TLS code from alknet-core/endpoint.rs into alknet-tls
-status: pending
+status: completed
 depends_on: [tls/crate-init]
 scope: moderate
 risk: medium

tasks/tls/tests.md

@@ -1,7 +1,7 @@
 ---
 id: tls/tests
 name: Move and adapt TLS tests from endpoint.rs and call_client.rs into alknet-tls
-status: pending
+status: completed
 depends_on: [tls/client-extract]
 scope: moderate
 risk: low