feat: npm workspaces, packable packages, and Changesets release CI

[maxnorm]

Summary

Changes Made

• npm workspaces: Added a root compose-workspace with workspaces for src, cli, and website, plus a root package-lock.json and shared scripts (compose@ci, check, pack checks, Changesets helpers).
• Library package: Added src/package.json for @perfect-abstractions/compose (Solidity files, changelog, readme, license in the published tarball via prepack / postpack).
• CLI package: Renamed and aligned @perfect-abstractions/compose-cli (cli/package.json) with publishing metadata, pack:check / prepublishOnly, and a dedicated cli/LICENSE.md; aligned initial version with the library (0.0.1).
• Changesets: Added .changeset/ config (including ignoring the docs workspace package) and root CHANGELOG.md; cli/CHANGELOG.md updated for the new versioning line.
• Release automation: Added GitHub Actions for Release (quality gates + Changesets version PR), Publish (after successful Release on main, optional skip when pending changesets remain, npm provenance, tag/npm verification, GitHub Releases), and Changeset Required on PRs touching src/ or cli/ (with skip-changeset label escape hatch).
• Documentation: Added RELEASING.md describing the two-package release model, contributor flow, and first-release checklist.
• .gitignore: Consolidated ignores (e.g. root node_modules/), dropped obsolete docs/ paths, and ignored src/CHANGELOG.md as a temporary file during changeset version.
• Website workspace: Bumped website/package.json / lockfile as needed for the monorepo layout.

Checklist

Before submitting this PR, please ensure:

• Code follows the Solidity feature ban - No inheritance, constructors, modifiers, public/private variables, external library functions, using for directives, or selfdestruct

• Code follows Design Principles - Readable, uses diamond storage, favors composition over inheritance

• Code matches the codebase style - Consistent formatting, documentation, and patterns (e.g. ERC20Facet.sol)

• Code is formatted with forge fmt

• Existing tests pass - Run tests to be sure existing tests pass.

• New tests are optional - If you don't provide tests for new functionality or changes then please create a new issue so this can be assigned to someone.

• All tests pass - Run forge test and ensure everything works

• Documentation updated - If applicable, update relevant documentation

Make sure to follow the contributing guidelines.

Additional Notes

[netlify]

👷 Deploy request for compose-diamonds pending review.

Visit the deploys page to approve it

Name	Link
🔨 Latest commit	d5a1247

[github-actions]

Coverage Report

Metric	Coverage	Details
Lines	79%	1560/1981 lines
Functions	92%	445/483 functions
Branches	74%	161/217 branches

Last updated: Thu, 26 Mar 2026 22:58:32 GMT for commit d5a1247

[github-actions]

Gas Report

No gas usage changes detected between main and feat/add-pkg.

All functions maintain the same gas costs. ✅

Last updated: Thu, 26 Mar 2026 22:59:04 GMT for commit d5a1247