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/infrastructure/src/store/template.rs

@@ -59,6 +59,8 @@ struct IndexEntry {
         skip_serializing_if = "Option::is_none"
     )]
     default_mcp_tool_policy: Option<McpToolPolicy>,
+    #[serde(default, skip_serializing_if = "std::ops::Not::not")]
+    default_contactable: bool,
 }
 
 /// On-disk shape of `templates/index.json`.
@@ -170,6 +172,7 @@ impl FsTemplateStore {
             default_agent_name: entry.default_agent_name.clone(),
             default_system_permissions: entry.default_system_permissions.clone(),
             default_mcp_tool_policy: entry.default_mcp_tool_policy.clone(),
+            default_contactable: entry.default_contactable,
         })
     }
 }
@@ -220,6 +223,7 @@ impl TemplateStore for FsTemplateStore {
             default_agent_name: template.default_agent_name.clone(),
             default_system_permissions: template.default_system_permissions.clone(),
             default_mcp_tool_policy: template.default_mcp_tool_policy.clone(),
+            default_contactable: template.default_contactable,
         };
         if let Some(slot) = index.templates.iter_mut().find(|e| e.id == template.id) {
             *slot = row;