Adds broad inline comments and JSDoc for CLI, cron, outbound/channel, plugin SDK, ACP, shared helpers, net policy, and related utility contracts. Proof: git diff --check on latest exact head plus focused cron tests passed; CI had no failing checks observed before merge attempt.
Forward OpenAI-compatible stop sequences from gateway chat completions through the agent runner into provider transports.
The gateway now normalizes stop into sampling extras, agent transports pass it into the shared stream options, and OpenAI, Anthropic, Mistral, Google, and Vertex-backed simple providers map it to their native request fields. Provider/gateway/agent coverage plus Crabbox live gateway proof verify valid stop dispatch and invalid stop rejection.
Refs #87920