[fix] Exclude POSIX special files from inventory

[paul-fresquet]

Summary:

• Skip POSIX special files during inventory building without marking parts incomplete.

Key changes:

• Stop creating inaccessible FileDescriptions for POSIX special files; record global skipped entry and warn.
• Update unit and integration tests to assert exclusion and skipped entries.

Notes/risks:

• Inventory parts are no longer marked incomplete for POSIX special files; downstream logic may change accordingly.

[sonarqubecloud]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

This PR updates inventory building to exclude POSIX special files/directories (e.g., FIFO, block devices) from generated inventories, while still tracking them as skipped entries and avoiding marking inventory parts as incomplete due to access.

Changes:

• Stop emitting inaccessible FileDescriptions for POSIX special files; instead record a SkippedEntry with SkipReason.SpecialPosixFile and log a warning.
• Add/adjust unit and integration tests to assert POSIX special entries are excluded from inventories and properly recorded as skipped.
• Add warning logging for POSIX special directories when encountered during directory analysis.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/ByteSync.Client.UnitTests/Services/Inventories/InventoryBuilderInspectorTests.cs	Updates expectations for POSIX special files and adds coverage for POSIX special directories being skipped without marking parts incomplete.
tests/ByteSync.Client.IntegrationTests/Services/Inventories/TestInventoryBuilder.cs	Updates POSIX FIFO integration test to assert exclusion from inventory and presence in InventoryProcessData.SkippedEntries.
src/ByteSync.Client/Services/Inventories/InventoryBuilder.cs	Refactors file skip logic into TryHandleFileSkip, removes creation of inaccessible descriptions for POSIX special files, and adds warning log for POSIX special directories.

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