Refactor owner scope across channels and fix default routing fallback (#1151)

* refactor: add explicit owner scope across channels

* fix: tighten routine owner target routing

* fix: address owner scope review feedback

* Fix owner-scope onboarding and event trigger isolation

* Tighten routing fallback and wizard owner validation

* fix: address owner-scope follow-up review

* fix: tighten owner-scope follow-up details

* fix: import Channel trait in telegram test

* fix: normalize http webhook sender ids

* fix: address remaining owner-scope review issues

* fix: reconcile config rebase fallout

* fix: reconcile extension manager rebase drift

* fix: address current copilot review regressions

* fix: restore clippy matrix after rebase

src/testing/mod.rs

@@ -439,6 +439,7 @@ impl TestHarnessBuilder {
         };
 
         let deps = AgentDeps {
+            owner_id: "default".to_string(),
             store: Some(Arc::clone(&db)),
             llm,
             cheap_llm: None,
@@ -1077,7 +1078,7 @@ mod tests {
             },
             notify: NotifyConfig {
                 channel: None,
-                user: "user1".to_string(),
+                user: Some("user1".to_string()),
                 on_attention: true,
                 on_failure: true,
                 on_success: false,
@@ -1210,7 +1211,7 @@ mod tests {
             },
             notify: NotifyConfig {
                 channel: None,
-                user: "user1".to_string(),
+                user: Some("user1".to_string()),
                 on_attention: false,
                 on_failure: false,
                 on_success: false,