fix: tighten small-model audit guardrails

docs/cli/security.md

@@ -21,3 +21,4 @@ clawdbot security audit --fix
 ```
 
 The audit warns when multiple DM senders share the main session and recommends `session.dmScope="per-channel-peer"` for shared inboxes.
+It also warns when small models (<=300B) are used without sandboxing and with web/browser tools enabled.