[AAASM-4648] 📝 (packaging): Fix misleading OS classifier for platform wheels

[Chisanan232]

Description

The published PyPI metadata for agent-assembly declared the trove classifier
Operating System :: OS Independent, but the release ships platform-specific
native (Rust-extension) wheels for macOS and Linux only — there is no Windows
(win_amd64) wheel. A Windows developer trusting the classifier gets no
compatible wheel and the installer falls back to building the sdist, which needs
a Rust/maturin toolchain and fails on a stock Windows machine.

This replaces the false OS Independent claim with the OSes we actually publish
wheels for:

• Operating System :: POSIX :: Linux
• Operating System :: MacOS

Windows is out of scope (no win_amd64 wheel is built), so the corrected
classifier now matches the published wheel set. No behavior change — packaging
metadata only.

Type of Change

• ✨ New feature
• 🔧 Bug fix
• ♻️ Refactoring
• 🍀 Performance improvement
• 📚 Documentation update
• 🚀 Release

Breaking Changes

• No

Related Issues

• Related JIRA ticket: AAASM-4648
• Fix Version: agent-assembly v0.0.1-rc.6

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No tests required (explain why)

Metadata-only change. Verified pyproject.toml still parses (tomllib) and the
Operating System classifiers now read POSIX :: Linux + MacOS. Verification
per ticket: the PyPI project page's platform list matches the published wheel set
(Linux/macOS) once rc.6 publishes.

Checklist

• Code follows project style guidelines
• Self-review completed
• Comments added for complex logic
• Documentation updated if needed
• All tests passing

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[Chisanan232]

🤖 Claude Code — PR review

CI state: GREEN — 24/24 checks pass (CI unit+integration, CodeQL, SonarCloud, Codecov, PEP 561, wheel-matrix drift guard, docs build). mergeStateStatus: BLOCKED reflects required-review approval, not a CI failure. Nothing to fix.

Scope coverage: Fully covers AAASM-4648's ## Fix. The ticket offered two options — list the actually-supported OSes, or omit the OS classifier. This PR takes the first: drops the false Operating System :: OS Independent and replaces it with Operating System :: POSIX :: Linux + Operating System :: MacOS, matching the published wheel set (macOS + Linux native wheels; no win_amd64). Windows-out-of-scope is stated per the ticket. No gaps.

Side-effect assessment: None at runtime. The change is packaging metadata only (pyproject.toml trove classifiers); it does not touch any importable module or behavior. pyproject.toml still parses. The corrected classifier is purely advisory PyPI metadata.

FE: No FE-app change; packaging metadata only. Playwright validation N/A.

Verdict: READY to merge (pending required review approval).