Add interactive ClientConsole example to Python, C# and C SDKs

[Copilot]

• Add SDK/python/examples/client_console.py (Python SDK)
• Add SDK/csharp/examples/ClientConsole/{ClientConsole.csproj,Program.cs} (C# SDK) and register in CsmTcpRouter.sln
• Add SDK/c/examples/client_console.c (C SDK) and register in SDK/c/CMakeLists.txt
• All three implement an identical REPL: same csm> prompt, same command set, same output formatting
• Validate port CLI argument in Python and C# (matching the C example) — print Error: invalid port '<value>' and exit 1 on non-integer or out-of-range input

[Copilot]

Pull request overview

Adds an interactive clientConsole REPL example to the Python, C#, and C SDKs to provide a consistent, cross-language console for connecting to a CSM-TCP-Router server and issuing common commands.

Changes:

• Added new interactive REPL examples for Python (client_console.py), C# (examples/ClientConsole), and C (client_console.c).
• Registered the new C# example project in CsmTcpRouter.sln.
• Added a new C example target (client_console) to the C SDK CMake build.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
SDK/python/examples/client_console.py	New Python REPL console example (stdin-driven) with unified commands/output.
SDK/csharp/examples/ClientConsole/Program.cs	New C# REPL console implementation using the C# SDK APIs.
SDK/csharp/examples/ClientConsole/ClientConsole.csproj	New C# example project definition referencing the SDK project.
SDK/csharp/CsmTcpRouter.sln	Adds the new C# example project to the solution and build configs.
SDK/c/examples/client_console.c	New C REPL console example using the C SDK APIs and callbacks.
SDK/c/CMakeLists.txt	Adds client_console executable target under CSM_BUILD_EXAMPLES.

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[Copilot]

port = int(argv[2]) will raise ValueError and abort the program if the user passes a non-integer port (e.g. python client_console.py localhost abc). Consider catching this and printing an Error: invalid port '<value>' message (and returning nonzero), similar to the C example’s validation.

Suggested change

	port = int(argv[2]) if len(argv) > 2 else DEFAULT_PORT
	if len(argv) > 2:
	try:
	port = int(argv[2])
	except ValueError:
	print(f"Error: invalid port '{argv[2]}'")
	return 1
	else:
	port = DEFAULT_PORT

[Copilot]

int.Parse(args[1]) will throw FormatException/OverflowException on invalid input and terminate the console. Consider using int.TryParse (and range-checking 1–65535) to print a friendly Error: invalid port '<value>' message and exit cleanly.

Suggested change

	int port = args.Length > 1 ? int.Parse(args[1]) : DefaultPort;
	int port = DefaultPort;
	if (args.Length > 1)
	{
	if (!int.TryParse(args[1], out port) || port < 1 || port > 65535)
	{
	Console.WriteLine($"Error: invalid port '{args[1]}'");
	return 1;
	}
	}

[nevstop]

@copilot apply changes based on the comments in this thread

[Copilot]

@copilot apply changes based on the comments in this thread

Applied port validation in both the Python and C# client_console examples — non-integer or out-of-range values now print Error: invalid port '<value>' and exit 1, matching the C example. Commit 54470c4.