fix(desktop): resolve all remaining P1 defects (P1-02/05/06, P1-01 experimental)

- P1-02: Heartbeat auto-initialized in kernel_init for default agent
- P1-05: CloneManager shows warning when deleting active agent + auto-switch
- P1-06: AgentInfo returns soul/system_prompt/temperature/max_tokens
- P1-01: Browser Hand marked experimental (requires Fantoccini bridge)
- Updated DEFECT_LIST.md: all P1 resolved (0 active)
- Updated RELEASE_READINESS.md: all P1 sections reflect current status

desktop/src-tauri/src/intelligence/heartbeat.rs

@@ -250,7 +250,7 @@ impl HeartbeatEngine {
     }
 
     /// Restore heartbeat history from VikingStorage metadata (called during init)
-    async fn restore_history(&self) {
+    pub async fn restore_history(&self) {
         let key = format!("heartbeat:history:{}", self.agent_id);
         match crate::viking_commands::get_storage().await {
             Ok(storage) => {
@@ -730,7 +730,7 @@ pub async fn heartbeat_init(
 
 /// Restore the last interaction timestamp for an agent from VikingStorage.
 /// Called during heartbeat_init so the idle-greeting check works after restart.
-async fn restore_last_interaction(agent_id: &str) {
+pub async fn restore_last_interaction(agent_id: &str) {
     let key = format!("heartbeat:last_interaction:{}", agent_id);
     match crate::viking_commands::get_storage().await {
         Ok(storage) => {