feat: changelog bot (GitHub App)

[jxom]

Adds a GitHub App bot that handles PR changelog checks, replacing the GitHub Action approach to support fork PRs (which can't access secrets).

What

• Webhook handler (bot/api/webhook.ts) — listens for pull_request.opened and pull_request.synchronize events
• GitHub integration (bot/lib/github.ts) — PR file listing, diff fetching, workspace package discovery (Rust/Cargo + Python/uv/Poetry)
• AI changelog generation (bot/lib/ai.ts) — uses Cerebras API (Llama 3.3 70B) to suggest changelog entries from PR diffs
• Comment management (bot/lib/comment.ts) — builds PR comments with pre-filled "Add changelog" links

Setup

1. Create a GitHub App with Pull requests: Read and Issues: Write permissions
2. Deploy to Vercel with env vars: GITHUB_APP_ID, GITHUB_PRIVATE_KEY, GITHUB_WEBHOOK_SECRET, CEREBRAS_API_KEY (optional)

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
changelogs-rs	Ready	Preview, Comment	Feb 8, 2026 11:49pm

[github-actions]

⚠️ Changelog not found.

A changelog entry is required before merging. We've generated a suggested changelog based on your changes:

Preview

---
changelogs: minor
---

Added GitHub bot for automated changelog generation and validation. The bot is a GitHub App built with Cloudflare Workers that checks PRs for changelog files, detects changed packages, and generates AI-powered changelog suggestions using Cerebras API.

Add changelog to commit this to your branch.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​vitest@​4.0.18
	npm/​@​types/​node@​25.2.2
	npm/​vite@​7.3.1
	npm/​@​octokit/​rest@​21.1.1
	npm/​typescript@​5.9.3
	npm/​@​octokit/​auth-app@​7.2.2
	npm/​wrangler@​4.63.0
	npm/​@​biomejs/​biome@​2.3.14
	npm/​@​cloudflare/​workers-types@​4.20260207.0

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: npm vite is 91.0% likely obfuscated Confidence: 0.91 Location: Package overview From: bot/package.json → npm/vite@7.3.1 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/vite@7.3.1. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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