feat: add macOS native library support

[iamchorchos]

Summary

Add native pbivnorm support for macOS Intel (x86_64) and Apple Silicon (aarch64).

The release workflow now builds, validates, and packages macOS .dylib files alongside Linux; CI adds native smoke tests on both macOS architectures. Documentation and native licensing notes now cover the supported platforms.

Validation

• Reviewed the native loader mapping for macOS/Darwin, Intel, and ARM64.
• Ran git diff --check.
• Verified workflow expressions and artifact handoff paths manually.
• macOS smoke tests will run on GitHub-hosted macos-15-intel and macos-14 runners after push.
• Did not run ./mvnw verify locally because untracked src/test/java/main.java currently contains invalid Java and would break test compilation.

Checklist

• I kept the pull request focused and reviewed my own diff.
• I ran `./mvnw verify'.
• I added or updated tests for changed behavior.
• I updated public documentation when required.
• I documented the source and tolerance of new numerical reference data. Not applicable.
• I verified that new code, data and dependencies have compatible licenses.
• I did not commit secrets, generated build output or local configuration.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Coverage ∅ diff coverage · +0.00% coverage variation

Metric	Results
Coverage variation	✅ +0.00% coverage variation (-1.00%)
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (b967aaa)	1672	1532	91.63%
Head commit (ba910d4)	1672 (+0)	1532 (+0)	91.63% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#19)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

AI Reviewer: first review requested successfully. AI can make mistakes. Always validate suggestions.

_{TIP This summary will be updated as you push new changes.}

[codacy-production]

Pull Request Overview

The PR successfully introduces the necessary infrastructure and documentation for macOS native library support on both Intel and Apple Silicon architectures. Codacy quality checks indicate the code is up to standards. However, there are blocking issues in the CI/CD configuration: the use of non-standard runner labels (macos-15-intel) will prevent the workflows from executing in standard GitHub-hosted environments.

Furthermore, there is a functional discrepancy: the PR description discusses native loader mapping, but the submitted diff contains no changes to Java source files. This suggests that either the implementation is incomplete or the current loader logic's ability to handle the new directory structure has not been verified within this changeset. Finally, the CHANGELOG entries are incorrectly ordered, which should be corrected to ensure accurate release documentation.

About this PR

• The PR lacks Java code changes for native loader mapping despite the description mentioning it. Please confirm if the existing loader logic automatically supports the new native/macos-<arch>/ directory structure or if the loader changes were accidentally omitted from this commit.

Test suggestions

• Compile pbivnorm.f into a dynamic library on macOS Intel using static linking
• Compile pbivnorm.f into a dynamic library on macOS ARM64 using static linking
• Verify the absence of Homebrew dynamic links in the compiled dylib using otool
• Execute BivariateNormalTest on macOS runners to verify native code execution
• Verify that the produced JAR contains the dylibs at the expected native/macos-/ paths

Low confidence findings

• Ensure that any local untracked files, such as src/test/java/main.java, are removed to prevent unexpected compilation failures in the build environment.

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