`initialMatrices[i]` is provably defined because the loop bound is
`i < tickCount` and `initialMatrices.length === tickCount`. TS doesn't
track that, so use a non-null assertion to silence TS18048.
The other ~30 errors reported in CI run 25797533005 were all downstream
of `TS2307: Cannot find module '@jarvis/bus'` — they disappear once
`pnpm install` + `bash scripts/build-webview.sh` generates the bus
package's `dist/index.d.ts`. No code change needed for those.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
james.maesandClaude Opus 4.7