fix: hide Honcho session line on CLI load when no API key configured (#1582)

HonchoClientConfig.from_env() set enabled=True unconditionally,
even when HONCHO_API_KEY was not set. When ~/.honcho/config.json
didn't exist, from_global_config() fell back to from_env() and
returned enabled=True with a null api_key, causing the Honcho
session indicator to display on every CLI launch.

Fix: from_env() now sets enabled=bool(api_key), matching the
auto-enable logic already used in from_global_config().
Also added api_key guard to the CLI display as defense-in-depth.

cli.py

@@ -5550,7 +5550,7 @@ class HermesCLI:
             from honcho_integration.client import HonchoClientConfig
             from agent.display import honcho_session_line, write_tty
             hcfg = HonchoClientConfig.from_global_config()
-            if hcfg.enabled:
+            if hcfg.enabled and hcfg.api_key:
                 sname = hcfg.resolve_session_name(session_id=self.session_id)
                 if sname:
                     write_tty(honcho_session_line(hcfg.workspace_id, sname) + "\n")