fix(review): surface respawn-storm env vars in config.yaml + docs

Follow-up to PR #66479 salvage. The three new env vars
(HERMES_LOCAL_STREAM_STALE_TIMEOUT, HERMES_GATEWAY_MAX_STARTS,
HERMES_GATEWAY_START_WINDOW_S) were introduced as bare env-var reads with no
config.yaml surface or documentation — violating the .env-is-for-secrets-only
policy (behavioral settings must live in config.yaml, bridged to env internally).

- config.yaml: add gateway.respawn_storm {max_starts, window_seconds} to
  DEFAULT_CONFIG, mirroring the existing restart_loop_guard pattern.
- gateway.py: read config.yaml first, env vars override as escape-hatch.
- environment-variables.md: document all three new env vars, noting the
  config.yaml alternative for the gateway ones.
- chat_completion_helpers.py: cross-reference the env-var docs from the
  local stale timeout comment.

scripts/release.py

@@ -57,6 +57,7 @@ LEGACY_AUTHOR_MAP = {
     "252620095+briandevans@users.noreply.github.com": "briandevans",  # PR #64951 salvage (lmstudio: clamp max/ultra reasoning effort)
     "kar.iskakov@gmail.com": "karfly",  # PR #64012 salvage (gateway: surface extended reasoning efforts)
     "kimyeon30@naver.com": "rlaehddus302",  # PR #61985 salvage (gateway: secondary-adapter auth callback profile)
+    "burke@autreymail.com": "bautrey",  # PR #66479 salvage (gateway reliability hardening: Bedrock liveness, supervised watchers, launchd respawn throttle)
     "agungsubastian1963@gmail.com": "aguung",  # PR #64461 salvage (gateway: multiplex secret_scope for authz/Slack/webhooks)
     "jtstothard@gmail.com": "jtstothard",  # PR #63256 salvage (gateway: multiplex secondary adapter config validation)
     "fjlaowan@proton.me": "fjlaowan1983",  # PR #11256 salvage (honcho: reject whitespace-only reasoning queries)