feat(cross-project): découverte et contact inter-projets — tools MCP idea_project_{list,read_context,list_agents,ask_agent,cancel_agent}, permission contactable par agent + default_contactable persistée dans les templates, routage orchestrator par projectId+agentId — #260 (tests ciblés verts, QA en attente)

crates/app-tauri/src/templates.rs

@@ -78,6 +78,8 @@ impl TemplateToolProvider for AppTemplateToolProvider {
                             "defaultMcpToolPermissions",
                             "defaultMcpToolPolicy",
                         )?,
+                        default_contactable: optional_bool(&arguments, "defaultContactable")?
+                            .unwrap_or(false),
                     })
                     .await
                     .map_err(template_error)?;
@@ -160,6 +162,17 @@ fn optional_string<'a>(
     }
 }
 
+fn optional_bool(value: &Value, key: &str) -> Result<Option<bool>, TemplateToolError> {
+    match value.get(key) {
+        None | Some(Value::Null) => Ok(None),
+        Some(Value::Bool(value)) => Ok(Some(*value)),
+        Some(_) => Err(TemplateToolError::new(
+            "invalid",
+            format!("field `{key}` must be a boolean"),
+        )),
+    }
+}
+
 fn optional_json_value<T>(arguments: &Value, key: &str) -> Result<Option<T>, TemplateToolError>
 where
     T: serde::de::DeserializeOwned,
@@ -317,6 +330,7 @@ mod tests {
                     "defaultAgentName": "Base Agent",
                     "defaultSystemPermissions": { "network": "allow" },
                     "defaultMcpToolPermissions": { "allowedTools": ["idea_template_read"] },
+                    "defaultContactable": true,
                 }),
             )
             .await
@@ -332,6 +346,7 @@ mod tests {
             created["defaultMcpToolPermissions"],
             json!({ "allowedTools": ["idea_template_read"] })
         );
+        assert_eq!(created["defaultContactable"], true);
 
         let read = provider
             .handle_template_tool(
@@ -353,6 +368,7 @@ mod tests {
             read["defaultMcpToolPermissions"],
             json!({ "allowedTools": ["idea_template_read"] })
         );
+        assert_eq!(read["defaultContactable"], true);
 
         let listed = provider
             .handle_template_tool(&project(), "agent", "idea_template_list", json!({}))
@@ -370,6 +386,7 @@ mod tests {
                     "content": "v2",
                     "defaultSystemPermissions": { "network": "deny" },
                     "defaultMcpToolPermissions": { "allowedTools": ["idea_template_update"] },
+                    "defaultContactable": false,
                 }),
             )
             .await
@@ -385,6 +402,7 @@ mod tests {
             updated["defaultMcpToolPermissions"],
             json!({ "allowedTools": ["idea_template_update"] })
         );
+        assert_eq!(updated["defaultContactable"], false);
         assert_eq!(
             store
                 .get(TemplateId::from_uuid(