Add fast GCP assistant iteration lane

[adamcohenhillel]

What changed

• add an assistant-apk GCP Lab lane that restores the warm Android snapshot, builds only OpenPhoneAssistant, and publishes the signed APK, SHA-256 sidecar, and source ref
• retry disposable snapshot labs and cache refreshes across configured fallback zones only for GCP capacity stockouts
• let device eval workflows consume OPENAI_API_KEY from GitHub Actions secrets while preserving the ignored local-file fallback
• add contract checks and update the build/testing documentation

Why

The AI Phone iteration loop depended on a full Android image build, one GCP zone, and machine-local eval secret files. That made assistant-only changes slower and made the CI path fragile after moving development to a new computer or when the primary GCP zone had no capacity.

Impact

Assistant changes can return a pushable APK without rebuilding/exporting a complete image. GCP capacity shortages can fail over without hiding build, permission, or configuration failures. The persistent physical-device runner can execute eval workflows using the existing repository secret instead of requiring a copied secret file.

Validation

• ./scripts/check.sh
• git diff --check
• Bash syntax checks for the changed scripts
• live disposable GCP run using the warm snapshot: focused assistant build completed, 6.7 MB APK copied back, checksum and source SHA verified, VM and per-run disk deleted
• local ARM64 OpenPhone AVD boot and smoke, including openphone_agent
• physical OpenPhone Pixel 9a verification
• openphone-device self-hosted runner confirmed online and idle

Not run

• full model trajectory suite / benchmark; the updated workflow and secret wiring are not active until this change lands
• OpenClaw gateway smoke; no local OpenClaw gateway was active during device verification
• actionlint was not installed locally

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Project	Deployment	Actions	Updated (UTC)
openphone-docs	Ready	Preview, Comment	Jul 18, 2026 10:54pm