[chrarnoldus]

Summary

Prep PR split out of #7052. Adds a build-ai-gateway CI job that runs next build for apps/ai-gateway, so a broken gateway build fails on the PR rather than at deploy time. The gateway is already on main (#6806) but CI never builds it.

• The job uses the same dummy environment as the web build job. It also copies apps/web/.env and apps/web/.env.test into the app directory, because the gateway runs with the web app's environment (see apps/ai-gateway/scripts/dev.sh).
• A new ai_gateway paths filter gates the job. It matches apps/ai-gateway/**, packages/**, the web env files, ci.yml, package.json and the lockfile. packages/** is broad on purpose: web-shared imports many workspace packages and their dependencies, and the build takes about a minute.
• The filter is in both the first attempt and the retry, and scripts/changes-filter-retry.test.mjs now expects the new filter name.
• Failures on main still notify Slack through notify-main-failure.yml, which watches the whole CI run.

Verification

• node --test scripts/changes-filter-retry.test.mjs scripts/stacked-ci.test.mjs scripts/deployment-workflows.test.mjs passes (39 tests).
• Ran the job's build command locally for apps/ai-gateway, with the same env values and env-file copies the job uses: it builds in about 15s. The job has also passed on [AISAGE-502] feat(ai-gateway): add a manual Vercel deploy for kilocode-ai-gateway #7052.

Visual Changes

N/A

Reviewer Notes

This PR changes ci.yml, so the cloud-agent-next suite runs on it too. That suite flaked once on #7052 (a miniflare worker exited unexpectedly) and passed on rerun.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

CI-only change: the build-ai-gateway job mirrors the web build's dummy env setup, gates on the new ai_gateway output, and the ai_gateway filter is byte-identical in both the first and retry attempts, with scripts/changes-filter-retry.test.mjs pinning the new filter name. No defects found in the changed lines.

Files Reviewed (2 files)

• .github/workflows/ci.yml
• scripts/changes-filter-retry.test.mjs

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