chore: remove CI/CD release workflow and add manual publishing docs

[jaruesink]

Summary by CodeRabbit

• Documentation

  • Updated versioning and publishing guidance detailing the Changesets workflow with automatic CI/CD publishing
  • Added comprehensive Publishing section documenting automated publishing via npm trusted publishers and manual workflows

• Chores

  • Updated CI/CD release workflow to support automated publishing via OIDC, eliminating the need for long-lived npm tokens
  • Updated GitHub Actions dependencies to latest versions

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Walkthrough

This PR implements npm trusted publishers (OIDC) for automated CI/CD releases, replacing NPM_TOKEN-based authentication. The GitHub Actions workflow is updated with OIDC permissions and tool version bumps, while documentation is expanded to guide both automatic and manual publishing workflows through this new authentication path.

Changes

Cohort / File(s)	Summary
Publishing Documentation AGENTS.md, .cursor/rules/versioning-with-npm.mdc, README.md	Adds and expands guidance on CI/CD publishing via npm trusted publishers (OIDC). Documents removal of long-lived npm tokens, clarifies Changesets workflow with automatic publishing, and provides comprehensive setup instructions including prerequisite configuration on npmjs.com.
CI/CD Workflow .github/workflows/release.yml	Adds OIDC permissions block (id-token: write), updates checkout action to v4, updates Node setup to v4 with version 22, bumps Yarn from 4.4.1 to 4.9.1, changes install command to --immutable, and removes NPM_TOKEN environment variable.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 No tokens tucked away in my burrow so deep,
OIDC trust lets publishing secrets keep,
GitHub and npm in harmony dance,
CI/CD's magic—no token perchance!
To the registry I hop, free and light! 🚀

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch changeset-release/main

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