Docs: avoid dotnet run build output on MCP stdio

[zdeneksrejber]

Disclaimer: I don't know if this should be merged, but I have troubles running the MCP locally, these are the steps that helped me actually run it

Summary

• update src/TALXIS.CLI.MCP/README.md to avoid plain dotnet run for stdio MCP sessions
• document the safe local workflow: build first, then run with --no-build
• update Inspector and command-line debugging examples to keep stdout reserved for MCP traffic

Why

dotnet run performs a build before launching the MCP server. Build warnings can be emitted before the stdio transport is ready, and MCP clients may try to parse those warning lines as protocol messages. The updated guidance separates the build step from the stdio session.