fix: prevent context pressure warning spam after compression (#4012)

* feat: add /yolo slash command to toggle dangerous command approvals

Adds a /yolo command that toggles HERMES_YOLO_MODE at runtime, skipping
all dangerous command approval prompts for the current session. Works in
both CLI and gateway (Telegram, Discord, etc.).

- /yolo -> ON: all commands auto-approved, no confirmation prompts
- /yolo -> OFF: normal approval flow restored

The --yolo CLI flag already existed for launch-time opt-in. This adds
the ability to toggle mid-session without restarting.

Session-scoped — resets when the process ends. Uses the existing
HERMES_YOLO_MODE env var that check_all_command_guards() already
respects.

* fix: prevent context pressure warning spam (agent loop + gateway rate-limit)

Two complementary fixes for repeated context pressure warnings spamming
gateway users (Telegram, Discord, etc.):

1. Agent-level loop fix (run_agent.py):
   After compression, only reset _context_pressure_warned if the
   post-compression estimate is actually below the 85% warning level.
   Previously the flag was unconditionally reset, causing the warning
   to re-fire every loop iteration when compression couldn't reduce
   below 85% of the threshold (e.g. very low threshold like 15%,
   or system prompt alone exceeds the warning level).

2. Gateway-level rate-limit (gateway/run.py, salvaged from PR #3786):
   Per-chat_id cooldown of 1 hour on compression warning messages.
   Both warning paths ('still large after compression' and 'compression
   failed') are gated. Defense-in-depth — even if the agent-level fix
   has edge cases, users won't see more than one warning per hour.

Co-authored-by: dlkakbs <dlkakbs@users.noreply.github.com>

---------

Co-authored-by: dlkakbs <dlkakbs@users.noreply.github.com>

gateway/run.py

@@ -476,6 +476,13 @@ class GatewayRunner:
         self._honcho_managers: Dict[str, Any] = {}
         self._honcho_configs: Dict[str, Any] = {}
 
+        # Rate-limit compression warning messages sent to users.
+        # Keyed by chat_id — value is the timestamp of the last warning sent.
+        # Prevents the warning from firing on every message when a session
+        # remains above the threshold after compression.
+        self._compression_warn_sent: Dict[str, float] = {}
+        self._compression_warn_cooldown: int = 3600  # seconds (1 hour)
+
         # Ensure tirith security scanner is available (downloads if needed)
         try:
             from tools.tirith_security import ensure_installed
@@ -2400,13 +2407,18 @@ class GatewayRunner:
                                         pass
 
                                 # Still too large after compression — warn user
+                                # Rate-limited to once per cooldown period per
+                                # chat to avoid spamming on every message.
                                 if _new_tokens >= _warn_token_threshold:
                                     logger.warning(
                                         "Session hygiene: still ~%s tokens after "
                                         "compression — suggesting /reset",
                                         f"{_new_tokens:,}",
                                     )
-                                    if _hyg_adapter:
+                                    _now = time.time()
+                                    _last_warn = self._compression_warn_sent.get(source.chat_id, 0)
+                                    if _hyg_adapter and _now - _last_warn >= self._compression_warn_cooldown:
+                                        self._compression_warn_sent[source.chat_id] = _now
                                         try:
                                             await _hyg_adapter.send(
                                                 source.chat_id,
@@ -2428,7 +2440,10 @@ class GatewayRunner:
                         if _approx_tokens >= _warn_token_threshold:
                             _hyg_adapter = self.adapters.get(source.platform)
                             _hyg_meta = {"thread_id": source.thread_id} if source.thread_id else None
-                            if _hyg_adapter:
+                            _now = time.time()
+                            _last_warn = self._compression_warn_sent.get(source.chat_id, 0)
+                            if _hyg_adapter and _now - _last_warn >= self._compression_warn_cooldown:
+                                self._compression_warn_sent[source.chat_id] = _now
                                 try:
                                     await _hyg_adapter.send(
                                         source.chat_id,