[F49 steps 2 + 3] live verification: buffered recovery replay + unsubscribe skip

Step 3 (F47 buffered unsubscribe skip):
- crates/mxaccess-compat/tests/buffered_unsubscribe_skip_live.rs.
- Subscribe buffered, sleep so the engine has DataUpdates in flight,
  then call unsubscribe. Asserts Ok return without surfacing transport
  or HRESULT errors.
- Session::unsubscribe (session.rs:2261) probes the registry: if
  Buffered { .. }, it skips nmx.un_advise entirely, mirroring the .NET
  reference's `if (!subscription.IsBuffered)` guard at
  MxNativeSession.cs:361-381. If unsubscribe accidentally emitted
  UnAdvise for a buffered correlation id, the engine would return
  non-zero HRESULT (no matching plain advise to retract) — surfacing
  as a panic.

Step 2 (F45 buffered recovery replay):
- crates/mxaccess-compat/tests/buffered_recovery_replay_live.rs.
- Subscribe buffered, drain >=1 NMX subscription message
  (cmd=0x32 SubscriptionStatus + cmd=0x33 DataUpdate) to confirm the
  wire path is hot pre-recovery, install a RebuildFactory that calls
  NmxClient::create (the same auto-resolving COM-activation path
  Session::connect_nmx_auto uses), invoke recover_connection, drain
  >=1 NMX subscription message post-recovery.
- Verifies the replay branch in recover_connection_core re-issues
  RegisterReference (NOT AdviseSupervisory) for the buffered entry,
  mirroring MxNativeSession.ReAdviseSubscription (cs:538-569).
  Structural property is unit-tested; this confirms the engine
  actually picks back up after the rebuild + replay.

Both tests pass live on this Galaxy:
  cargo test -p mxaccess-compat --features live-windows-com \
      --test buffered_unsubscribe_skip_live -- --ignored --nocapture
  cargo test -p mxaccess-compat --features live-windows-com \
      --test buffered_recovery_replay_live -- --ignored --nocapture

Pulls mxaccess-nmx + mxaccess-codec into mxaccess-compat dev-deps so
the recovery test can build a RebuildFactory closure that returns
NmxClient and bind a typed broadcast Receiver.

design/followups.md F49 -> Resolved (all five steps pass live).
docs/M6-live-verification.md updated with per-step evidence + repro
commands.

F49 is fully closed out. F55 (DCOM-managed INmxSvcCallback, Path A)
and F56 (missing EnsurePublisherConnected + post-RegisterReference
AdviseSupervisory for buffered) were the two real Rust-port bugs
uncovered along the way; both resolved. Remaining post-V1 followups
(F50 Suspend/Activate Frida, F51 ASB type matrix, F52 perf, F53 doc
lint, etc.) are scoped independently and not part of F49.

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

rust/crates/mxaccess-compat/Cargo.toml

@@ -31,6 +31,11 @@ mxaccess-rpc = { path = "../mxaccess-rpc", version = "0.0.0" }
 # silently accepts for writes but doesn't dispatch DataUpdate frames
 # against. The buffered live test resolves real IDs via SqlTagResolver.
 mxaccess-galaxy = { path = "../mxaccess-galaxy", version = "0.0.0", features = ["galaxy-resolver"] }
+# F49 step 2 — recovery replay test needs the
+# `mxaccess::RebuildFactory` typedef's NmxClient + the
+# NmxSubscriptionMessage type for the broadcast receiver signature.
+mxaccess-nmx = { path = "../mxaccess-nmx", version = "0.0.0", features = ["windows-com"] }
+mxaccess-codec = { path = "../mxaccess-codec", version = "0.0.0" }
 # Live tests use tracing-subscriber to dump router/dcom_sink trace
 # events on demand (set RUST_LOG=mxaccess=trace,mxaccess_callback=trace).
 tracing = { workspace = true }