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/irc/adapter.py

@@ -107,7 +107,10 @@ class IRCAdapter(BasePlatformAdapter):
 
         # Connection settings (env vars override config.yaml)
         self.server = os.getenv("IRC_SERVER") or extra.get("server", "")
-        self.port = int(os.getenv("IRC_PORT") or extra.get("port", 6697))
+        try:
+            self.port = int(os.getenv("IRC_PORT") or extra.get("port", 6697))
+        except (ValueError, TypeError):
+            self.port = 6697
         self.nickname = os.getenv("IRC_NICKNAME") or extra.get("nickname", "hermes-bot")
         self.channel = os.getenv("IRC_CHANNEL") or extra.get("channel", "")
         self.use_tls = (