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Alem Tuzlak 5427706e70 fix: harden release system — registry error handling, tag check, prerelease tests (#3858)
## Summary

Ports 3 proven patterns from ag-ui's release system to CopilotKit.

### C1: Registry error vs 404 distinction
`getPublishedVersion` in `publish-release.ts` now distinguishes between
npm E404 (package genuinely not published — proceed) and real errors
(network timeout, auth failure, rate limit — stop). Previously all
errors returned `null`, silently bypassing the version guard.

### C2: Pre-existing tag check
Added a check in `publish-release.yml` that verifies the tag doesn't
already exist before attempting to create it. Prevents the "published
but no tag" state on retries.

### C3: Pre-publish tests in prerelease
Added `pnpm run test` between build and publish in the canary workflow.
A broken canary erodes trust in the prerelease channel.

**Cross-pollination context:** [Notion
page](https://www.notion.so/3413aa38185281828aa1dfa014808ddc)
The ag-ui side (strict version ordering, AI release notes, atomic PR
creation) ships via ag-ui PR #1487.

## Test plan

- [ ] Verify `getPublishedVersion` returns null on E404 but throws on
network errors
- [ ] Verify pre-existing tag check fails fast before publish
- [ ] Verify prerelease workflow runs tests before canary publish

🤖 Generated with [Claude Code](https://claude.com/claude-code)
2026-04-16 12:31:29 +02:00
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