Improve open source readiness

[morehardy]

Summary

• Add MIT licensing, community docs, security/conduct policies, roadmap, changelog, and GitHub issue templates.
• Improve README discoverability with badges, canonical repository links, license status, and community entry points.
• Add PyPI discovery metadata and tests for keywords, classifiers, license, and project URLs.

Test Plan

• PYTHONPATH=src uv run --python 3.14 python -m unittest discover -s tests -p 'test_*.py'
• uv build
• uv run --python 3.14 --with twine python -m twine check dist/echoalign_asr_mlx-0.5.1.dev0+gb77713fee.d20260526*
• External implementation audit: Approved

[gemini-code-assist]

Code Review

This pull request adds comprehensive community and project health files, including a contributing guide, code of conduct, security policy, roadmap, changelog, and GitHub issue templates. It also updates PyPI package metadata in pyproject.toml and adds a test to verify these metadata fields. Feedback on the test suite points out that resolving pyproject.toml using a relative path from the current working directory can cause FileNotFoundError if tests are run from a different directory, and suggests resolving the path relative to the test file's location instead.

[gemini-code-assist]

Using Path("pyproject.toml") assumes that the current working directory of the test runner is always the repository root. If the tests are executed from another directory (e.g., from within the tests directory), this will raise a FileNotFoundError. It is more robust to resolve the path relative to the test file's location using __file__.

Suggested change

	pyproject = tomllib.loads(Path("pyproject.toml").read_text(encoding="utf-8"))
	pyproject = tomllib.loads((Path(__file__).parent.parent / "pyproject.toml").read_text(encoding="utf-8"))

[morehardy]

Fixed in 8b5205b. tests/test_package.py now resolves pyproject.toml relative to the test file via Path(__file__).resolve().parents[1], and both metadata tests use the shared helper. Verified from the repo root and from the tests/ directory.