fix(desktop,tui-gateway,zai): stop thinking-off from reverting to medium

A Z.ai desktop user reported thinking reverting to medium after one turn,
burning ~200% of a week's credits in 4 days despite reasoning_effort: false
in config.yaml. Four compounding bugs:

- _session_info reported reasoning_effort "" for disabled reasoning,
  indistinguishable from unset — the desktop adopted it after the first
  turn, wiping its sticky "thinking off" pick so every later chat
  reverted to the default effort.
- config.set key=reasoning always wrote agent.reasoning_effort to global
  config.yaml, so every desktop model-menu selection (preset.effort ??
  'medium') clobbered the user's configured value. Now session-scoped
  like the messaging gateway's /reasoning, landing on
  create_reasoning_override so lazily-built sessions keep it too.
- YAML `reasoning_effort: false`/`off`/`no` (boolean False) was coerced
  to "" by every loader's `str(x or "")`, silently re-enabling thinking.
  parse_reasoning_effort now treats False/"false"/"disabled" as
  {"enabled": False}; loaders (tui gateway, gateway, cli, cron,
  delegate) pass the raw value through. The desktop config reader also
  crashed on the boolean (false.trim()), aborting voice/STT settings.
- The zai provider profile never sent thinking on the wire, and GLM-4.5+
  defaults to thinking ON server-side — so disabling reasoning was a
  silent no-op on direct Z.ai, the actual token burner. The profile now
  emits extra_body.thinking {"type": "enabled"|"disabled"} for
  thinking-capable GLM models, mirroring the DeepSeek profile.

Also: /new (session reset) now carries reasoning_config across the
rebuild like model_override; config.get reasoning prefers the session's
live value and maps a config False to "none"; Settings shows "Off"
instead of a blank select for hand-written false.

cli.py

@@ -334,11 +334,15 @@ def _resolve_prefill_messages_file(config: Dict[str, Any]) -> str:
     return ""
 
 
-def _parse_reasoning_config(effort: str) -> dict | None:
-    """Parse a reasoning effort level into an OpenRouter reasoning config dict."""
+def _parse_reasoning_config(effort) -> dict | None:
+    """Parse a reasoning effort level into an OpenRouter reasoning config dict.
+
+    Accepts the raw config value (string or YAML boolean — ``false``/``off``
+    parse as thinking disabled, see parse_reasoning_effort).
+    """
     from hermes_constants import parse_reasoning_effort
     result = parse_reasoning_effort(effort)
-    if effort and effort.strip() and result is None:
+    if effort and str(effort).strip() and result is None:
         logger.warning("Unknown reasoning_effort '%s', using default (medium)", effort)
     return result