feat(workstate): read-model live-state minimal des conversations/délégations (Lot A backend)

Introduit le module application `workstate` (modèle de read-model live + snapshots
des conversations/délégations en cours) et l'expose via la couche terminal
(exports mod/registry). Câble la surface Tauri : DTO, commande et state pour
exposer le live-state au frontend (lib + state + commands), avec tests.

QA verte. Réserve environnementale non bloquante : tests loopback socket Unix
réels non exécutables en sandbox (UnixListener::bind PermissionDenied),
alternatives avec skips vertes.

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

crates/application/src/terminal/mod.rs

@@ -28,7 +28,10 @@
 mod registry;
 mod usecases;
 
-pub use registry::{LiveAgentRegistry, LiveSessions, StructuredSessions, TerminalSessions};
+pub use registry::{
+    LiveAgentRegistry, LiveSessionKind, LiveSessionSnapshot, LiveSessions, StructuredSessions,
+    TerminalSessions,
+};
 pub use usecases::{
     CloseTerminal, CloseTerminalInput, CloseTerminalOutput, OpenTerminal, OpenTerminalInput,
     OpenTerminalOutput, ResizeTerminal, ResizeTerminalInput, WriteToTerminal, WriteToTerminalInput,

crates/application/src/terminal/registry.rs

@@ -13,6 +13,28 @@ use domain::conversation::ConversationId;
 use domain::ports::{AgentSession, PtyHandle};
 use domain::{AgentId, NodeId, SessionId, SessionKind, TerminalSession};
 
+/// Runtime family of a live agent session.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum LiveSessionKind {
+    /// Raw PTY-backed CLI session.
+    Pty,
+    /// Structured agent-session backend.
+    Structured,
+}
+
+/// Read-only coordinates of one live agent session.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct LiveSessionSnapshot {
+    /// The agent owning the live session.
+    pub agent_id: AgentId,
+    /// The layout node currently hosting the session view.
+    pub node_id: NodeId,
+    /// The live session id.
+    pub session_id: SessionId,
+    /// Which runtime registry owns the session.
+    pub kind: LiveSessionKind,
+}
+
 /// A registered, live terminal: its PTY handle plus the domain snapshot.
 #[derive(Debug, Clone)]
 struct Entry {
@@ -516,6 +538,31 @@ impl LiveSessions {
         all.extend(self.structured.live_agents());
         all
     }
+
+    /// Tous les agents vivants avec le type de registre source (PTY puis structuré).
+    #[must_use]
+    pub fn live_agent_snapshots(&self) -> Vec<LiveSessionSnapshot> {
+        let mut all: Vec<LiveSessionSnapshot> = self
+            .pty
+            .live_agents()
+            .into_iter()
+            .map(|(agent_id, node_id, session_id)| LiveSessionSnapshot {
+                agent_id,
+                node_id,
+                session_id,
+                kind: LiveSessionKind::Pty,
+            })
+            .collect();
+        all.extend(self.structured.live_agents().into_iter().map(
+            |(agent_id, node_id, session_id)| LiveSessionSnapshot {
+                agent_id,
+                node_id,
+                session_id,
+                kind: LiveSessionKind::Structured,
+            },
+        ));
+        all
+    }
 }
 
 impl LiveAgentRegistry for LiveSessions {