mbproxy: strip historical phase/wave/plan references from source comments

Comments described the *history* of how the code arrived (phase numbers,
wave IDs, review IDs, dated TODOs) instead of what it does today. That
scaffolding rotted as the codebase evolved. Cleaned 60 source files +
.gitignore; behaviour unchanged (387/387 tests still pass).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

mbproxy/src/Mbproxy/Proxy/Supervision/SupervisorState.cs

@@ -26,14 +26,14 @@ public enum SupervisorState
 }
 
 /// <summary>
-/// Immutable point-in-time snapshot of a supervisor's state. Consumed by Phase 07's
-/// status page via <see cref="PlcListenerSupervisor.Snapshot"/>.
+/// Immutable point-in-time snapshot of a supervisor's state. Consumed by the status
+/// page via <see cref="PlcListenerSupervisor.Snapshot"/>.
 ///
 /// <para><b>RecoveryAttempts semantics</b>: this counter <em>accumulates over the lifetime
 /// of the supervisor</em> and is never reset. Operators reading the status page should
 /// interpret it as "how many times has this listener faulted or failed to bind since
 /// the service started" — useful for detecting port-flapping or repeated OS network
-/// resets. Phase 07 surfaces it as-is.</para>
+/// resets.</para>
 /// </summary>
 /// <param name="State">Current state of the supervisor.</param>
 /// <param name="LastBindError">