Replace deprecated type exclusion in project with attribute

[josesimoes]

Description

• Remove entries from nfproj file and replace with attributes.

Motivation and Context

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)
• Unit Tests (add new Unit Test(s) or improved existing one(s), has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist:

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).
• I have added new tests to cover my changes.

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📝 Walkthrough

Walkthrough

This PR migrates type exclusion configuration in nanoFramework.System.Net from MSBuild project settings to semantic code attributes. Twelve types across socket, network configuration, and security namespaces are now decorated with [ExcludeType], replacing the centralized NFMDP_PE_ExcludeClassByName build configuration.

Changes

Type exclusion attribute application

Layer / File(s)	Summary
Socket namespace enum exclusions nanoFramework.System.Net/Sockets/AddressFamily.cs, ProtocolFamily.cs, ProtocolType.cs, SelectMode.cs, SocketErrors.cs, SocketFlags.cs, SocketOptionLevel.cs, SocketOptionName.cs, SocketType.cs	Nine socket enums are each decorated with [ExcludeType] and their files import System.Runtime.CompilerServices to enable the attribute.
Network configuration and security type exclusions nanoFramework.System.Net/NetworkHelper/IPConfiguration.cs, NetworkInformation/NetworkInformationOptions.cs, NetworkInformation/WirelessAPStation.cs, Security/NetworkSecurity.cs	Four types (IPConfiguration class, NetworkInformationOptions enum, PhyProtocols enum, SslVerification enum) are decorated with [ExcludeType], with CompilerServices imports added as needed.
Remove obsolete MSBuild exclusion configuration nanoFramework.System.Net/System.Net.nfproj	The NFMDP_PE_ExcludeClassByName ItemGroup is removed, replacing build-time configuration with declarative attribute-based type exclusion. Project file formatting is normalized.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: replacing deprecated type exclusion configuration in the project file with attributes on the type declarations.
Description check	✅ Passed	The description is related to the changeset, explaining the core objective of removing nfproj entries and replacing them with attributes, though it lacks detail on motivation and testing.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[josesimoes]

@coderabbitai review

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[nfbot]

🛑 Native version bump required — now resolved.

Checksum changed from 0x48CC063D to 0xFD3B5E5F. Native version was not bumped (100.20.0.1) — this has since been corrected to 100.20.0.2.

[nfbot]

⚠️ Native declaration update required!

The checksum and/or native version of nanoFramework.System.Net have changed. The native declaration in nf-interpreter must be updated before this package can be released.

	Previously published	This build
Native version	100.20.0.1	100.20.0.2
Checksum	0x48CC063D	0xFD3B5E5F

👉 Tracking issue: nanoframework/Home#1753

The issue contains a link to the stubs artifact from this build and instructions for GitHub Copilot to perform the update.

[josesimoes]

@nfbot updatedependencies develop