fix(clients): align client version constants to package manifests (CLI-18/21/26/29)

- .NET: add explicit <Version>0.1.2</Version> to client csproj (CLI-18)
- Go: ClientVersion 0.1.0-dev -> 0.1.2 (CLI-21)
- Python: __version__ 0.1.0 -> 0.1.2 to match pyproject.toml (CLI-26)
- Rust: CLIENT_VERSION now sourced from env!(CARGO_PKG_VERSION) so it
  cannot drift from Cargo.toml (CLI-29)

Verified: dotnet build clean; go build/test ok; cargo check/test/clippy
clean; pytest 127 passed. P2 client version-drift cluster.

Claude-Session: https://claude.ai/code/session_01DMXXvNuPekkkrTEyPNxEkW

clients/dotnet/ZB.MOM.WW.MxGateway.Client/ZB.MOM.WW.MxGateway.Client.csproj

@@ -19,6 +19,7 @@
   <PropertyGroup>
     <IsPackable>true</IsPackable>
     <PackageId>ZB.MOM.WW.MxGateway.Client</PackageId>
+    <Version>0.1.2</Version>
     <Description>.NET 10 gRPC client for the MxAccessGateway service. Provides typed wrappers, retry, and a lazy-browse walker over the Galaxy Repository hierarchy.</Description>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <!-- Only the shipped library generates XML docs (matching src/Contracts). The Cli and

clients/go/mxgateway/version.go

@@ -1,9 +1,9 @@
 package mxgateway
 
 const (
-	// ClientVersion identifies this Go client scaffold before package releases
-	// assign semantic versions.
-	ClientVersion = "0.1.0-dev"
+	// ClientVersion is the released semantic version of this Go client module.
+	// Keep it in sync with the module tag applied by scripts/tag-go-module.ps1.
+	ClientVersion = "0.1.2"
 
 	// GatewayProtocolVersion matches GatewayContractInfo.GatewayProtocolVersion
 	// in the shared .NET contracts.

clients/python/src/zb_mom_ww_mxgateway/version.py

@@ -1,3 +1,3 @@
 """Package version information."""
 
-__version__ = "0.1.0"
+__version__ = "0.1.2"

clients/rust/src/version.rs

@@ -3,8 +3,9 @@
 //! The protocol versions track the values the gateway and worker negotiate on
 //! `OpenSession` and let test harnesses cross-check the wire contract.
 
-/// Semantic version of this Rust client crate. Mirrors `Cargo.toml`.
-pub const CLIENT_VERSION: &str = "0.1.0-dev";
+/// Semantic version of this Rust client crate. Sourced from `Cargo.toml` at
+/// compile time so the two cannot drift.
+pub const CLIENT_VERSION: &str = env!("CARGO_PKG_VERSION");
 
 /// Public gateway gRPC protocol version this client targets.
 pub const GATEWAY_PROTOCOL_VERSION: u32 = 3;