Adds a --format flag to hermes chat single-query mode. stream-json
emits newline-delimited JSON events (init, text, tool_use, tool_result,
result envelope with token stats + exit code) to stdout for CI
pipelines and external tooling. Session ID stays on stderr.
Salvaged from PR #12278 by @ProDrifterDK onto current main, including
the follow-up commit enforcing the single-query contract (implies
quiet, rejects --tui, emits a final result record with exit code 130
on interrupt).
Alan
1657a1ce2d