fix(channels): use platform message IDs to prevent duplicate memories

Fixes #430 - Prevents duplicate memories after restart by using platform message IDs instead of random UUIDs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/security/policy.rs

@@ -1,5 +1,5 @@
-use serde::{Deserialize, Serialize};
 use parking_lot::Mutex;
+use serde::{Deserialize, Serialize};
 use std::path::{Path, PathBuf};
 use std::time::Instant;
 
@@ -40,9 +40,7 @@ impl ActionTracker {
 
     /// Record an action and return the current count within the window.
     pub fn record(&self) -> usize {
-        let mut actions = self
-            .actions
-            .lock();
+        let mut actions = self.actions.lock();
         let cutoff = Instant::now()
             .checked_sub(std::time::Duration::from_secs(3600))
             .unwrap_or_else(Instant::now);
@@ -53,9 +51,7 @@ impl ActionTracker {
 
     /// Count of actions in the current window without recording.
     pub fn count(&self) -> usize {
-        let mut actions = self
-            .actions
-            .lock();
+        let mut actions = self.actions.lock();
         let cutoff = Instant::now()
             .checked_sub(std::time::Duration::from_secs(3600))
             .unwrap_or_else(Instant::now);
@@ -66,9 +62,7 @@ impl ActionTracker {
 
 impl Clone for ActionTracker {
     fn clone(&self) -> Self {
-        let actions = self
-            .actions
-            .lock();
+        let actions = self.actions.lock();
         Self {
             actions: Mutex::new(actions.clone()),
         }