chore(release): adopt Changesets and verified package releases

[CoderSerio]

Replace Semifold with Changesets so source PRs carry package-scoped release notes, and a generated release PR updates versions, exact internal dependencies, lockfiles, and changelogs together.

The alpha publishing path validates the release commit, preserves existing latest tags across partial-publication retries, checks exact registry versions, and creates per-package GitHub Releases only after acceptance. Existing unpublished changes from #108, #122, and #125 are carried forward. Beta publication remains separate work under #26.

Validation: release contract suite, real Changesets version/consume/repeat/stable-exit rehearsal, official offline packing, registry and GitHub API fixtures, release metadata, documentation checks, changeset policy, and safe dist-tag dry-run passed. No npm publication was performed.

Historical changelogs for all 10 packages were restored separately in #128 and are included here as the audited baseline for the new history-preservation check.

Setup required: the organization currently forbids Actions from creating pull requests. An owner must enable that policy, followed by the repository setting, for automatic version PRs. The maintainer guide includes the same version-and-review process as a manual fallback. A denied PR creation fails the workflow and cannot publish packages.

[coderabbitai]

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Note

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 9eb14852-cb84-4fcf-87ac-eafbb9e74c66

📥 Commits

Reviewing files that changed from the base of the PR and between c7ceb93 and 4f4e1bd.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (42)

• .changes/config.toml
• .changeset/README.md
• .changeset/config.json
• .changeset/named-abi-declarations.md
• .changeset/pre.json
• .changeset/scoped-abi-declarations.md
• .changeset/workspace-rebuild-recovery.md
• .github/PULL_REQUEST_TEMPLATE.md
• .github/workflows/docs.yml
• .github/workflows/release-alpha.yml
• .github/workflows/verify.yml
• .npmrc
• CONTRIBUTING.md
• README.md
• docs/maintainers/releases.md
• docs/project/status.md
• package.json
• scripts/source/alpha-publish-plan.ts
• scripts/source/create-github-releases.ts
• scripts/source/publish-alpha.ts
• scripts/source/release-model.ts
• scripts/source/semifold.ts
• scripts/source/sync-alpha-dist-tags.ts
• scripts/source/verify-change-policy.ts
• scripts/source/verify-changelogs.ts
• scripts/source/verify-changesets.ts
• scripts/source/verify-package-versions.ts
• scripts/source/verify-semifold-release-contract.ts
• scripts/source/version-packages.ts
• scripts/verify-lockfile-registry.mjs
• tests/alpha-publish-plan-contract.mjs
• tests/change-policy-contract.mjs
• tests/changelog-contract.mjs
• tests/changesets-release-contract.mjs
• tests/github-release-contract.mjs
• tests/helpers/registry-release-contract.mjs
• tests/published-release-contract.mjs
• tests/registry-consumer.mjs
• tests/registry-release-contract.mjs
• tests/release-contract.mjs
• tests/release-pipeline-contract.mjs
• tests/semifold-release-contract.mjs

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