fix(tui): /compact <instructions> reach the compaction request

The queued /compact command drained into Effect::Compact with only the
session id, so the instructions typed after the command never reached the
shell's compaction prompt (which already accepts userContext). The effect
carries the parsed instructions, trimmed so an edited queue row with
leading whitespace still counts.

Ported from upstream 1.0.22 (grok-build dispatch/queue.rs).

Claude-Session: https://claude.ai/code/session_01RUqV8HVGXcAETyYbZ2tPQ4

crates/codegen/kigi-tui/src/app/dispatch/queue.rs

@@ -162,6 +162,12 @@ fn format_cron_prompt(prompt: &str, task_id: &str, human_schedule: &str) -> Stri
     kigi_tools::reminders::format_scheduled_task_prompt(prompt, task_id, human_schedule)
 }
 
+/// `/compact <instructions>` text from a queued command; a queue edit may leave leading whitespace.
+pub(super) fn compact_user_context(text: &str) -> Option<String> {
+    let inv = crate::slash::parse_invocation(text.trim_start())?;
+    let args = inv.args.trim();
+    (inv.token == "compact" && !args.is_empty()).then(|| args.to_string())
+}
 /// Try to send the next queued entry (prompt, command, bash, or cron) if the agent is idle.
 ///
 /// Called after enqueue operations and task completions to advance the queue.
@@ -392,10 +398,12 @@ pub(crate) fn maybe_drain_queue(agent: &mut AgentView) -> Vec<Effect> {
             agent.end_work_announced = false;
             agent.session.start_command(AgentCommand::Compact);
             agent.turn_started_at = Some(Instant::now());
+            let user_context = compact_user_context(&queued.text);
 
             vec![Effect::Compact {
                 agent_id,
                 session_id,
+                user_context,
             }]
         }
         QueueEntryKind::BashCommand => {