phoenix_spectral

Finalize a PR by cleaning up comments, verifying test coverage, checking README accuracy, tightening type specs, and reviewing the PR title and description.

Review and address open (unresolved) GitHub PR review comments. Assesses relevance, correctness, and whether to implement in this PR or as a follow-up. For bugs, writes a failing test first. For design issues, considers updating CLAUDE.md.

Prepare and publish a new release of PhoenixSpectral. Updates CHANGELOG.md, mix.exs, and README.md with version information, analyzes git commits to determine semantic version, and guides through the release process.