fix: re-read persona system_prompt at spawn time for non-pack agents

desktop/src-tauri/src/managed_agents/runtime.rs

@@ -609,25 +609,20 @@ pub fn spawn_agent_child(
         command.env("SPROUT_ACP_PERSONA_NAME", persona_name);
     }
 
-    // Resolve system prompt and model: prefer the persona definition (if a
-    // persona pack is configured and the persona matched), otherwise fall back
-    // to the record-level overrides.
-    let has_persona_pack =
-        record.persona_pack_path.is_some() && record.persona_name_in_pack.is_some();
-    let persona_prompt_and_model: Option<(String, Option<String>)> = has_persona_pack
-        .then(|| {
-            record
-                .persona_id
-                .as_deref()
-                .and_then(|pid| {
-                    super::load_personas(app)
-                        .ok()?
-                        .into_iter()
-                        .find(|p| p.id == pid)
-                })
-                .map(|p| (p.system_prompt, p.model))
+    // Resolve system prompt and model: when a persona_id is set, always
+    // re-read the PersonaRecord at spawn time so edits take effect without
+    // deleting and recreating the agent. Fall back to the record-level
+    // snapshot only when no persona is linked or the persona can't be found.
+    let persona_prompt_and_model: Option<(String, Option<String>)> = record
+        .persona_id
+        .as_deref()
+        .and_then(|pid| {
+            super::load_personas(app)
+                .ok()?
+                .into_iter()
+                .find(|p| p.id == pid)
         })
-        .flatten();
+        .map(|p| (p.system_prompt, p.model));
 
     let (effective_prompt, effective_model) = match persona_prompt_and_model {
         Some((prompt, model)) => (Some(prompt), model),