feat(experts): add built-in expert skills with per-agent activation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src-tauri/src/bin/codeg_server.rs

@@ -57,6 +57,27 @@ async fn main() {
         chat_channel_manager: codeg_lib::app_state::default_chat_channel_manager(),
     });
 
+    // Install bundled expert skills into the central store
+    // (`~/.codeg/skills/`). Runs in the background; failures are logged
+    // but non-fatal.
+    tokio::spawn(async move {
+        let report = codeg_lib::commands::experts::ensure_central_experts_installed().await;
+        if !report.errors.is_empty() {
+            eprintln!(
+                "[Experts] install finished with {} error(s): {:?}",
+                report.errors.len(),
+                report.errors
+            );
+        } else {
+            eprintln!(
+                "[Experts] install ok: installed={} updated={} pending_review={}",
+                report.installed_count,
+                report.updated_count,
+                report.pending_user_review.len()
+            );
+        }
+    });
+
     // Start chat channel background tasks (event subscriber, command dispatcher, scheduler, auto-connect)
     state
         .chat_channel_manager