fix: guard int(os.getenv()) casts against malformed env vars (#40598)

A non-numeric value in env vars like HERMES_STREAM_RETRIES,
HERMES_KANBAN_SPECIFY_MAX_TOKENS, GOOGLE_CHAT_MAX_BYTES, IRC_PORT, etc.
raised ValueError at import/init and crashed startup. Parse them safely,
falling back to the default.

Unified onto the existing utils.env_int(key, default) helper for core/
hermes_cli/tools modules instead of the original PR's three duplicate
local helpers; plugins keep minimal inline guards (no core-utils import).
All existing max()/min()/`or extra.get()` wrappers preserved.

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

plugins/platforms/google_chat/adapter.py

@@ -540,8 +540,14 @@ class GoogleChatAdapter(BasePlatformAdapter):
         # they don't sit in the chat forever as "Hermes is thinking…".
         self._orphan_typing_messages: Dict[str, List[str]] = {}
         # FlowControl knobs (env-configurable).
-        self._max_messages = int(os.getenv("GOOGLE_CHAT_MAX_MESSAGES", "1"))
-        self._max_bytes = int(os.getenv("GOOGLE_CHAT_MAX_BYTES", str(16 * 1024 * 1024)))
+        try:
+            self._max_messages = int(os.getenv("GOOGLE_CHAT_MAX_MESSAGES", "1"))
+        except (ValueError, TypeError):
+            self._max_messages = 1
+        try:
+            self._max_bytes = int(os.getenv("GOOGLE_CHAT_MAX_BYTES", str(16 * 1024 * 1024)))
+        except (ValueError, TypeError):
+            self._max_bytes = 16 * 1024 * 1024
 
     # ------------------------------------------------------------------
     # Configuration loading and validation