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/tests/Mbproxy.Tests/Sim/SimulatorSmokeTests.cs

@@ -67,8 +67,8 @@ public sealed class SimulatorSmokeTests
     /// <summary>
     /// Reads holding register 1072 via FC03 and expects raw BCD value
     /// <c>0x1234</c> (4660 decimal). This register represents decimal 1234 stored as
-    /// BCD nibbles. Phase 04's e2e test will read the same register through the proxy
-    /// and assert binary 1234 — proving the proxy rewrote the response.
+    /// BCD nibbles. The end-to-end rewriter test reads the same register through the
+    /// proxy and asserts binary 1234 — proving the proxy rewrote the response.
     /// </summary>
     [Fact(Timeout = 5_000)]
     public async Task Simulator_FC03_ReturnsBCD_RawValueAtHR1072_0x1234()