0xbyt4 32519066dc fix(gateway): add HERMES_SESSION_KEY to session_context contextvars ...

Complete the contextvars migration by adding HERMES_SESSION_KEY to the
unified _VAR_MAP in session_context.py. Without this, concurrent gateway
handlers race on os.environ["HERMES_SESSION_KEY"].

- Add _SESSION_KEY ContextVar to _VAR_MAP, set_session_vars(), clear_session_vars()
- Wire session_key through _set_session_env() from SessionContext
- Replace os.getenv fallback in tools/approval.py with get_session_env()
  (function-level import to avoid cross-layer coupling)
- Keep os.environ set as CLI/cron fallback

Cherry-picked from PR #7878 by 0xbyt4.

2026-04-11 15:35:04 -07:00

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