JMR-devandClaude Opus 4.8
66da643249
Feasibility spike for sharding the e2e-preview job (the hand-provisioned API 37 / google_apis_ps16k 16 KB-page emulator), CI's longest leg (~16.4-17.6 min). docs/perf/api37-e2e-sharding-spike.md breaks the leg into fixed overhead B ~8.3 min (setup + boot + Gradle daemon/config/compile/install) vs parallelizable test execution T ~8.8 min, models B + T/N for N=2/3/4, and recommends N=2 (~17.1 -> ~12.7 min, ~28% off the critical path) capped by the API 30 matrix wall (~12.0 min) beyond N=3. DRAFT PoC (do NOT merge as-is): converts e2e-preview to a strategy.matrix.shard [0, 1] fan-out passing AndroidJUnitRunner numShards/shardIndex through the existing -Pandroid.testInstrumentationRunnerArguments.* channel (no GMD, no orchestrator, no Gradle change). Artifact names gain a shard suffix; ci-passed still lists e2e-preview once (matrix fan-in keeps the single gate). Local preflight stays single-emulator. Relates to #258. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>