Ensure that internal code is never exposed through InternalsVisibleTo

[dennisdoomen]

This PR hardens encapsulation so internals can’t leak via InternalsVisibleTo. It introduces the Microsoft.CodeAnalysis.Embedded attribute and applies it to internal types, ensuring they’re embedded and never surface across assembly boundaries even when another assembly is granted internals access.

Closes #31

[github-actions]

Test Results

84 tests  ±0   84 ✅ ±0   0s ⏱️ ±0s
 3 suites ±0    0 💤 ±0 
 3 files   ±0    0 ❌ ±0 

Results for commit 77e271c. ± Comparison against base commit fb8a019.

[coveralls]

Pull Request Test Coverage Report for Build 17012518801

Details

• 114 of 119 (95.8%) changed or added relevant lines in 2 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 96.341%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Pathy/ChainablePath.cs	105	110	95.45%

Files with Coverage Reduction	New Missed Lines	%
Pathy/ChainablePath.cs	3	95.45%

Totals
Change from base Build 16901442165:	0.0%
Covered Lines:	172
Relevant Lines:	180

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💛 - Coveralls

[Copilot]

Pull Request Overview

This PR introduces the Microsoft.CodeAnalysis.Embedded attribute to prevent internal types from being exposed through InternalsVisibleTo declarations, hardening encapsulation boundaries in the Pathy library.

• Applies the [Microsoft.CodeAnalysis.Embedded] attribute to internal types and classes
• Defines a custom EmbeddedAttribute class in the Microsoft.CodeAnalysis namespace
• Updates project configuration to use PATHY_PUBLIC define instead of MYPACKAGE_COMPILE

Reviewed Changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Pathy/ChainablePath.cs	Adds EmbeddedAttribute to internal types and defines the attribute class
Pathy.Globbing/PathyGlobbing.cs	Applies EmbeddedAttribute to internal extensions class and defines the attribute
Pathy.Globbing/Pathy.Globbing.csproj	Changes compile constant from MYPACKAGE_COMPILE to PATHY_PUBLIC
Pathy.Specs/ChainablePathSpecs.cs	Removes unused System.Linq import
Multiple API verification files	Updates expected public API surface after configuration changes
Package reference updates	Updates FluentAssertions, Verify.Xunit, and PackageGuard versions

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