Align runtime defaults, tests, docs, and generated artifacts with the newer GPT-5.4 baseline. Keep think-mode and prompt-routing expectations consistent after the model version bump.
Install pipeline: - cli-installer.ts, tui-installer.ts, tui-install-prompts.ts - install-validators.ts Model fallback: - model-fallback-types.ts, fallback-chain-resolution.ts - provider-availability.ts, provider-model-id-transform.ts
YeonGyu-Kim