feat: resolve local repository paths without Maven

[efegokdemir]

Summary

Adds a local ExecutorTool implementation for repository, artifact, and metadata path resolution without invoking Maveniverse Toolbox. Toolbox remains available for dump() and callers that explicitly need it.

Changes

• Resolve the effective local repository from Maven properties, settings, or the default location.
• Compute standard artifact and metadata paths locally.
• Document the dependency/runtime distinction and Toolbox opt-in behavior.
• Add focused regression coverage.

Testing

• mvn -pl maven-executor -Dtest=LocalRepositoryExecutorToolTest -DskipITs -Dcheckstyle.skip -Drat.skip -Dspotless.skip=true test — passed (3 tests)
• mvn -pl maven-executor -DskipTests -Dspotless.skip=true -Drat.skip checkstyle:check — passed
• git diff --cached --check — passed
• mvn -pl maven-executor -DskipITs -Dcheckstyle.skip -Drat.skip -Dspotless.skip=true verify — the existing EmbeddedMavenExecutorTest.defaultFs4CaptureOutputWithForcedColor failed because no ANSI codes were present; all other executed tests passed
• Spotless check is blocked by the repository formatter failing on existing Environment.java with a JDK/Palantir formatter NoSuchFieldError

Fixes #44