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/context/state.rs

@@ -121,6 +121,9 @@ pub struct JobContext {
     pub state: JobState,
     /// User ID that owns this job (for workspace scoping).
     pub user_id: String,
+    /// Channel-specific requester/actor ID, when different from the owner scope.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub requester_id: Option<String>,
     /// Conversation ID if linked to a conversation.
     pub conversation_id: Option<Uuid>,
     /// Job title.
@@ -202,6 +205,7 @@ impl JobContext {
             job_id: Uuid::new_v4(),
             state: JobState::Pending,
             user_id: user_id.into(),
+            requester_id: None,
             conversation_id: None,
             title: title.into(),
             description: description.into(),
@@ -233,6 +237,12 @@ impl JobContext {
         self
     }
 
+    /// Set the channel-specific requester/actor ID.
+    pub fn with_requester_id(mut self, requester_id: impl Into<String>) -> Self {
+        self.requester_id = Some(requester_id.into());
+        self
+    }
+
     /// Transition to a new state.
     pub fn transition_to(
         &mut self,