CI flake: Docs build

[clockwork-labs-bot]

Detected by CI Gremlin after a failed GitHub Actions attempt succeeded on rerun.

Tests:

• Docs build

Error:
Error: command ["pnpm", "build"] exited with code <signal 5>
2026-06-23T15:22:28.2678788Z

Failed job runs:

• https://github.com/clockworklabs/SpacetimeDB/actions/runs/28036526118/job/82991420705 (Docs build, attempt 2 -> 3)

Context:

• none

[clockwork-labs-bot]

Diagnosis for the linked failed attempt only: run 28036526118, job 82991420705, attempt 2.

The failure is in the Docs build job, step Docusaurus build, after checkout, Node setup, pnpm setup/cache, Rust setup, and target/debug/ci docs startup all succeeded. The docs job installed dependencies successfully, ran docs prebuild (node scripts/sync-agent-skills.mjs), then started pnpm build / docusaurus build. During the optimized Docusaurus production build, Node/V8 aborted with:

# Fatal error in , line 0
# RepresentationChangerError: node #857:StateValues of kMachNone (Internal) cannot be changed to kRepTagged
...
Error: command ["pnpm", "build"] exited with code <signal 5>

Root cause: this attempt hit a Node/V8 internal compiler fatal error while building the Docusaurus site, not a deterministic docs content or SpacetimeDB test failure. The runner had actions/setup-node@v3 configured for Node 22 and acquired Node 22.23.0; the process died with SIGTRAP/signal 5 from V8.

Suggested title: CI flake: Docs build Node/V8 RepresentationChangerError during Docusaurus build

Possible duplicates in the Test Flakes project:

• CI flake: Test Suite #5416: same pnpm build signal 5 class in Test Suite, also a Node/V8 fatal abort, but the fatal headline there was unreachable code while building crates/bindings-typescript.
• CI flake: TypeScript - Tests #5390: same signal 5 / SIGTRAP class in TypeScript - Tests, also a Node/V8 fatal abort, again with unreachable code while building the TypeScript package.

So #5416 and #5390 look related as Node/V8 signal 5 build flakes, but they are not exact duplicates of this Docusaurus RepresentationChangerError headline.