Add unit tests for the config

[marinofelipe]

• Unit tests the config, including the default rules validation against a fixture package
• Enable SPMGraphLintInput memberwise init
• Fix default lint rules to use the injected module definitions. i.e., isLiveModule

Also

• Enable Strict Concurrency
• Bump SPM to 6.2 and min supported Swift version to 6.1
• Update CI to build and test for both Xcode 16.4 and Xcode 26.0.1

[Copilot]

Pull Request Overview

This PR adds comprehensive unit tests for the SPMGraphConfig functionality, validates the default lint rules against a fixture package, and fixes issues with how default lint rules use injected module definitions.

Key Changes:

• Adds unit tests for all three default lint rules (liveModuleLiveDependency, baseOrInterfaceModuleLiveDependency, unusedDependencies)
• Creates a fixture package structure to validate lint rules against real package scenarios
• Fixes default lint rules to properly use injected isLiveModule predicates instead of hardcoded property access

Reviewed Changes

Copilot reviewed 20 out of 22 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
spmgraph.xctestplan	Registers the new test target in the test plan
Tests/SPMGraphDescriptionInterfaceTests/SPMGraphConfigTests.swift	Comprehensive unit tests for config and all lint rules
Tests/SPMGraphDescriptionInterfaceTests/Fixtures/Package+Fixture.swift	Helper function to load the fixture package for testing
Tests/SPMGraphDescriptionInterfaceTests/Fixtures/PackageFixture/Package.swift	Fixture package definition with various module dependency scenarios
Tests/SPMGraphDescriptionInterfaceTests/Fixtures/PackageFixture/Sources/*	Fixture module implementations demonstrating various dependency patterns
Tests/SPMGraphDescriptionInterfaceTests/Fixtures/PackageFixture/Tests/BaseModuleTests/*	Fixture test target
Sources/SPMGraphDescriptionInterface/SPMGraphConfigInterface.swift	Fixes lint rules to use injected predicates and makes Error enum Equatable
Sources/SPMGraphLint/SPMGraphLint.swift	Makes SPMGraphLintInput Equatable and exposes memberwise initializer
Package.swift	Adds new test target with fixture resources
.swiftpm/xcode/xcshareddata/xcschemes/spmgraph-Package.xcscheme	Updates Xcode scheme with test plan and test targets
Tests/Fixtures/Package/*	Removes old fixture package (replaced by new structure)

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[roveabruno]

o homi não para