chore: clean up repository configuration

[maxktz]

Remove obsolete repository files and simplify the remaining build configuration.

• remove the local PayKit architecture skill and .nvmrc
• pin Node 22 directly in workflows that previously read .nvmrc
• inline the PayKit tsdown configuration and remove its single-use root helper
• remove the unused lint-staged dependency
• remove the contributing guide and completed release-backfill notes

Validation:

• pnpm --filter paykitjs build
• pnpm exec oxlint --deny-warnings -- packages/paykit/tsdown.config.ts
• pnpm exec oxfmt --check packages/paykit/tsdown.config.ts
• pnpm install --frozen-lockfile --ignore-scripts --offline
• verified generated package exports, CLI, README, LICENSE, and migration copies
• verified removed files have no stale tracked references

---

Summary by cubic

Removes obsolete repository files and simplifies the build configuration.

• Removes the local PayKit architecture skill, .nvmrc, contributing guide, and release-backfill notes.
• Pins Node 22 directly in release.yml and verify-changesets.yml instead of reading .nvmrc.
• Inlines the PayKit tsdown config into packages/paykit/tsdown.config.ts and deletes tsdown.base.ts.
• Removes the unused lint-staged dependency and its lockfile entries.
• Removes the CONTRIBUTING link from the README.

^{Written for commit a616257. Summary will update on new commits.}

Summary by CodeRabbit

• Chores

  • Release and verification workflows now use Node.js 22 directly.
  • Removed the repository’s Node.js version file and unused lint-staged dependency.
  • Simplified package build configuration while preserving existing output behavior.

• Documentation

  • Removed outdated contribution, release backfill, and architecture guidance documents.
  • Removed the README link to the contribution guide.

[vercel]

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Project	Deployment	Actions	Updated
paykit	Building	Preview	Sep 16, 2026 6:30pm UTC

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: b49a78dc-1b37-41ee-9191-47541cc050f9

📥 Commits

Reviewing files that changed from the base of the PR and between 041fc75 and a616257.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (12)

• .agents/skills/paykit-architecture/SKILL.md
• .github/release-backfill/README.md
• .github/release-backfill/v0.0.6.md
• .github/release-backfill/v0.1.6.md
• .github/workflows/release.yml
• .github/workflows/verify-changesets.yml
• .nvmrc
• CONTRIBUTING.md
• README.md
• package.json
• packages/paykit/tsdown.config.ts
• tsdown.base.ts

---

📝 Walkthrough

Walkthrough

The pull request inlines the PayKit build configuration, pins Node.js 22 in two workflows, removes .nvmrc, and deletes obsolete skills, release notes, contribution guidance, and the lint-staged dependency.

Changes

Repository maintenance

Layer / File(s)	Summary
Inline PayKit build configuration packages/paykit/tsdown.config.ts, tsdown.base.ts	The PayKit package now defines its tsdown settings inline and runs preparePackageDist after successful builds. The shared configuration helper and type are deleted.
Pin Node.js in automation .github/workflows/release.yml, .github/workflows/verify-changesets.yml, .nvmrc	Both workflows use Node.js 22 directly. The .nvmrc file is removed.
Remove obsolete repository content .agents/skills/..., .github/release-backfill/..., CONTRIBUTING.md, README.md, package.json	The architecture skill, release backfill documents, contribution guide, README contribution link, and lint-staged dependency are removed.

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/cleanup

---

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_{A rabbit trims the build path clean
Node twenty-two now leads the scene
Old notes hop out of sight
Inline settings build just right
Fresh outputs greet the light}

_{Comment @coderabbitai help to get the list of available commands.}