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/memory/mod.rs

@@ -76,7 +76,10 @@ pub fn create_memory(
     // Auto-hydration: if brain.db is missing but MEMORY_SNAPSHOT.md exists,
     // restore the "soul" from the snapshot before creating the backend.
     if config.auto_hydrate
-        && matches!(classify_memory_backend(&config.backend), MemoryBackendKind::Sqlite | MemoryBackendKind::Lucid)
+        && matches!(
+            classify_memory_backend(&config.backend),
+            MemoryBackendKind::Sqlite | MemoryBackendKind::Lucid
+        )
         && snapshot::should_hydrate(workspace_dir)
     {
         tracing::info!("🧬 Cold boot detected — hydrating from MEMORY_SNAPSHOT.md");
@@ -143,10 +146,7 @@ pub fn create_memory_for_migration(
 }
 
 /// Factory: create an optional response cache from config.
-pub fn create_response_cache(
-    config: &MemoryConfig,
-    workspace_dir: &Path,
-) -> Option<ResponseCache> {
+pub fn create_response_cache(config: &MemoryConfig, workspace_dir: &Path) -> Option<ResponseCache> {
     if !config.response_cache_enabled {
         return None;
     }

src/memory/response_cache.rs

@@ -90,9 +90,7 @@ impl ResponseCache {
              WHERE prompt_hash = ?1 AND created_at > ?2",
         )?;
 
-        let result: Option<String> = stmt
-            .query_row(params![key, cutoff], |row| row.get(0))
-            .ok();
+        let result: Option<String> = stmt.query_row(params![key, cutoff], |row| row.get(0)).ok();
 
         if result.is_some() {
             // Bump hit count and accessed_at
@@ -109,13 +107,7 @@ impl ResponseCache {
     }
 
     /// Store a response in the cache.
-    pub fn put(
-        &self,
-        key: &str,
-        model: &str,
-        response: &str,
-        token_count: u32,
-    ) -> Result<()> {
+    pub fn put(&self, key: &str, model: &str, response: &str, token_count: u32) -> Result<()> {
         let conn = self
             .conn
             .lock()
@@ -162,19 +154,17 @@ impl ResponseCache {
         let count: i64 =
             conn.query_row("SELECT COUNT(*) FROM response_cache", [], |row| row.get(0))?;
 
-        let hits: i64 = conn
-            .query_row(
-                "SELECT COALESCE(SUM(hit_count), 0) FROM response_cache",
-                [],
-                |row| row.get(0),
-            )?;
+        let hits: i64 = conn.query_row(
+            "SELECT COALESCE(SUM(hit_count), 0) FROM response_cache",
+            [],
+            |row| row.get(0),
+        )?;
 
-        let tokens_saved: i64 = conn
-            .query_row(
-                "SELECT COALESCE(SUM(token_count * hit_count), 0) FROM response_cache",
-                [],
-                |row| row.get(0),
-            )?;
+        let tokens_saved: i64 = conn.query_row(
+            "SELECT COALESCE(SUM(token_count * hit_count), 0) FROM response_cache",
+            [],
+            |row| row.get(0),
+        )?;
 
         #[allow(clippy::cast_sign_loss)]
         Ok((count as usize, hits as u64, tokens_saved as u64))
@@ -363,7 +353,9 @@ mod tests {
         let (_tmp, cache) = temp_cache(60);
         let key = ResponseCache::cache_key("gpt-4", None, "日本語のテスト 🦀");
 
-        cache.put(&key, "gpt-4", "はい、Rustは素晴らしい", 30).unwrap();
+        cache
+            .put(&key, "gpt-4", "はい、Rustは素晴らしい", 30)
+            .unwrap();
 
         let result = cache.get(&key).unwrap();
         assert_eq!(result.as_deref(), Some("はい、Rustは素晴らしい"));

src/memory/snapshot.rs

@@ -64,7 +64,10 @@ pub fn export_snapshot(workspace_dir: &Path) -> Result<usize> {
 
     let now = Local::now().format("%Y-%m-%d %H:%M:%S").to_string();
     output.push_str(&format!("**Last exported:** {now}\n\n"));
-    output.push_str(&format!("**Total core memories:** {}\n\n---\n\n", rows.len()));
+    output.push_str(&format!(
+        "**Total core memories:** {}\n\n---\n\n",
+        rows.len()
+    ));
 
     for (key, content, _category, created_at, updated_at) in &rows {
         output.push_str(&format!("### 🔑 `{key}`\n\n"));