feat: add config toggle to disable secret redaction

New config option:

  security:
    redact_secrets: false  # default: true

When set to false, API keys, tokens, and passwords are shown in
full in read_file, search_files, and terminal output. Useful for
debugging auth issues where you need to verify the actual key value.

Bridged to both CLI and gateway via HERMES_REDACT_SECRETS env var.
The check is in redact_sensitive_text() itself, so all call sites
(terminal, file tools, log formatter) respect it.

gateway/run.py

@@ -118,6 +118,12 @@ if _config_path.exists():
         _tz_cfg = _cfg.get("timezone", "")
         if _tz_cfg and isinstance(_tz_cfg, str) and "HERMES_TIMEZONE" not in os.environ:
             os.environ["HERMES_TIMEZONE"] = _tz_cfg.strip()
+        # Security settings
+        _security_cfg = _cfg.get("security", {})
+        if isinstance(_security_cfg, dict):
+            _redact = _security_cfg.get("redact_secrets")
+            if _redact is not None:
+                os.environ["HERMES_REDACT_SECRETS"] = str(_redact).lower()
     except Exception:
         pass  # Non-fatal; gateway can still run with .env values