fix: handle agent completed/cancelled statuses in job executor

The linux_patch_api agent returns "completed" as its terminal success
status, but the worker only recognized "succeeded". This caused the
worker to log "unexpected agent status — ignoring" every 60 seconds
and never mark patch jobs as finished.

Changes:
- job_executor.rs: match "completed" alongside "succeeded" as terminal
  success status, mapping both to patch_job_hosts.status = succeeded
- job_executor.rs: match "cancelled" as a terminal failure status,
  routing to handle_host_failure with appropriate error message
- pm-agent-client types.rs: updated AgentJobStatus doc comment to
  list all valid agent statuses: queued, running, succeeded, completed,
  failed, cancelled

crates/pm-agent-client/src/types.rs

@@ -184,7 +184,7 @@ pub struct ApplyPatchesResponse {
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct AgentJobStatus {
     pub job_id: String,
-    /// Current status: `"running"`, `"succeeded"`, `"failed"`, or `"cancelled"`.
+    /// Current status: `"queued"`, `"running"`, `"succeeded"`, `"completed"`, `"failed"`, or `"cancelled"`.
     pub status: String,
     pub progress_percent: Option<u8>,
     pub output: Option<String>,

crates/pm-worker/src/job_executor.rs

@@ -552,7 +552,7 @@ async fn poll_single_host(pool: PgPool, config: Arc<AppConfig>, row: PatchJobHos
     };
 
     match status.status.as_str() {
-        "succeeded" => {
+        "succeeded" | "completed" => {
             tracing::info!(pjh_id = %row.id, "poll_single_host: agent job succeeded");
             if let Err(e) = sqlx::query(
                 r#"
@@ -587,6 +587,13 @@ async fn poll_single_host(pool: PgPool, config: Arc<AppConfig>, row: PatchJobHos
                 "poll_single_host: job still in progress"
             );
         },
+        "cancelled" => {
+            tracing::info!(pjh_id = %row.id, "poll_single_host: agent job cancelled");
+            let err_msg = status
+                .error
+                .unwrap_or_else(|| "Agent job was cancelled".to_string());
+            handle_host_failure(pool, row.id, err_msg).await;
+        },
         other => {
             tracing::warn!(
                 pjh_id = %row.id,