Self-Hosted Gemma 4 on TPU v6e: Deployment & SRE with Antigravity

Measured 2026–07–21 on vllm/vllm-tpu:nightly (vLLM 0.23.1rc1.dev1076), a GCE flex-start ct6e-standard-1t (one TPU v6e chip, 32 GB HBM) in…