feat(session-limits): LS7 — câblage backend app-tauri (taps niveaux 1&2 + reprise annulable)

Branche le SessionLimitService dans l'application Tauri et expose la
surface de reprise/annulation au front.

- application/agent/lifecycle.rs : LaunchAgentOutput.profile exposé
  (None sur réattache/idempotent, Some sur lancement effectif).
- application/terminal/registry.rs : StructuredSessions::meta_for_session()
  (lookup agent/node par SessionId pour le tap niveau 1).
- app-tauri/state.rs : ResumeContext(s), AppAgentResumer (impl du port
  AgentResumer au-dessus de LaunchAgent), instanciation + câblage du
  SessionLimitService (TokioScheduler + drain des réveils) dans AppState::build.
- app-tauri/commands.rs : taps niveau 1 (agent_send) et niveau 2
  (launch_agent, parser regex confiné), alimentation de resume_contexts,
  commande cancel_resume.
- app-tauri/lib.rs : enregistrement de cancel_resume dans le handler.
- app-tauri/Cargo.toml : dépendance async-trait.

Tests : session_limit_wiring.rs (2 tests de composition) + meta_for_session
dans structured_registry_d1.rs ; fixtures dto_agents/dto_chat ajustées
(profile: None). Tout vert.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/app-tauri/tests/session_limit_wiring.rs

@@ -0,0 +1,98 @@
+//! Integration test for the **session-limit** wiring in the composition root
+//! (ARCHITECTURE §21, LS7).
+//!
+//! Proves that [`AppState`] actually *constructs and wires* the
+//! `SessionLimitService` (the gap LS7 closes: the LS1–LS4 domain/application
+//! machinery existed but was never instantiated at runtime). The detect→plan→
+//! resume→cancel logic itself is covered by the application/infrastructure unit
+//! tests (LS3/LS4); here we assert the **composition** the commands rely on:
+//! the service is present, `on_rate_limited` arms a cancellable resume that emits
+//! the domain events on the real bus, and `cancel_resume` is a clean no-op for an
+//! unknown agent (never a panic).
+
+use std::path::PathBuf;
+use std::time::Duration;
+
+use app_tauri_lib::state::AppState;
+use domain::events::DomainEvent;
+use domain::ids::NodeId;
+use domain::AgentId;
+use infrastructure::UuidGenerator;
+use domain::ports::IdGenerator;
+
+fn temp_path(tag: &str) -> PathBuf {
+    let ids = UuidGenerator::new();
+    std::env::temp_dir().join(format!("idea-sl-test-{tag}-{}", ids.new_uuid()))
+}
+
+fn agent(n: u128) -> AgentId {
+    AgentId::from_uuid(uuid::Uuid::from_u128(n))
+}
+
+fn node(n: u128) -> NodeId {
+    NodeId::from_uuid(uuid::Uuid::from_u128(n))
+}
+
+/// `cancel_resume` on an agent with no armed resume returns `false` (and never
+/// panics): the service is wired and behaves as a clean no-op.
+#[tokio::test]
+async fn cancel_resume_is_a_clean_noop_for_unknown_agent() {
+    let state = AppState::build(temp_path("appdata"));
+    assert!(
+        !state.session_limit_service.cancel_resume(agent(1)),
+        "no armed resume ⇒ cancel returns false"
+    );
+}
+
+/// A structured rate-limit signal with a **future** reset arms a cancellable
+/// resume: the wired service publishes `AgentRateLimited` then
+/// `AgentResumeScheduled` on the **real** event bus, and `cancel_resume` then
+/// publishes `AgentResumeCancelled` and returns `true`.
+#[tokio::test]
+async fn on_rate_limited_arms_a_cancellable_resume_over_the_real_bus() {
+    let state = AppState::build(temp_path("appdata"));
+    let mut rx = state.event_bus.raw_receiver();
+
+    // Reset far in the future so the scheduler does NOT fire before we cancel.
+    let resets_at_ms = i64::MAX;
+    state
+        .session_limit_service
+        .on_rate_limited(agent(7), node(70), None, Some(resets_at_ms));
+
+    // The two arming events, in order, on the bus.
+    let mut saw_rate_limited = false;
+    let mut saw_scheduled = false;
+    for _ in 0..32 {
+        match tokio::time::timeout(Duration::from_secs(2), rx.recv()).await {
+            Ok(Ok(DomainEvent::AgentRateLimited { agent_id, .. })) if agent_id == agent(7) => {
+                saw_rate_limited = true;
+            }
+            Ok(Ok(DomainEvent::AgentResumeScheduled { agent_id, .. })) if agent_id == agent(7) => {
+                saw_scheduled = true;
+                break;
+            }
+            Ok(Ok(_)) => continue,
+            _ => break,
+        }
+    }
+    assert!(saw_rate_limited, "AgentRateLimited relayed on the bus");
+    assert!(saw_scheduled, "AgentResumeScheduled relayed on the bus");
+
+    // The window is cancellable: cancel succeeds and emits AgentResumeCancelled.
+    assert!(
+        state.session_limit_service.cancel_resume(agent(7)),
+        "an armed resume is cancellable"
+    );
+    let mut saw_cancelled = false;
+    for _ in 0..32 {
+        match tokio::time::timeout(Duration::from_secs(2), rx.recv()).await {
+            Ok(Ok(DomainEvent::AgentResumeCancelled { agent_id })) if agent_id == agent(7) => {
+                saw_cancelled = true;
+                break;
+            }
+            Ok(Ok(_)) => continue,
+            _ => break,
+        }
+    }
+    assert!(saw_cancelled, "AgentResumeCancelled relayed on the bus");
+}