feat(tui): show session workspace (cwd) in the status bar

SessionWorkspaceBoundEvent already recorded the bound workspace root but
it was never surfaced. Map it to a new session.workspace_bound frame
(sealed ServerMessage variant, auto-registered; re-emitted on reconnect
via the snapshot replay), carry it on Session.WorkspaceRoot, and show it
home-abbreviated in the status bar (⌂ ~/Programs/correx). Golden test
pins the decode.

apps/server/src/main/kotlin/com/correx/apps/server/bridge/DomainEventMapper.kt

@@ -12,6 +12,7 @@ import com.correx.core.events.events.ArtifactCreatedEvent
 import com.correx.core.events.events.ChatSessionStartedEvent
 import com.correx.core.events.events.ChatTurnEvent
 import com.correx.core.events.events.InferenceCompletedEvent
+import com.correx.core.events.events.SessionWorkspaceBoundEvent
 import com.correx.core.events.events.WorkflowStartedEvent
 import com.correx.core.events.events.InferenceStartedEvent
 import com.correx.core.events.events.InferenceTimeoutEvent
@@ -69,6 +70,13 @@ suspend fun domainEventToServerMessage(
             sessionSequence = sessionSequence,
         )
 
+        is SessionWorkspaceBoundEvent -> ServerMessage.SessionWorkspaceBound(
+            sessionId = p.sessionId,
+            workspaceRoot = p.workspaceRoot,
+            sequence = seq,
+            sessionSequence = sessionSequence,
+        )
+
         is ChatTurnEvent -> ServerMessage.ChatTurn(
             sessionId = p.sessionId,
             turnId = p.turnId,

apps/server/src/main/kotlin/com/correx/apps/server/protocol/ServerMessage.kt

@@ -46,6 +46,16 @@ sealed interface ServerMessage {
         override val sessionSequence: Long,
     ) : ServerMessage, SessionMessage
 
+    /** The workspace root a session was bound to, from SessionWorkspaceBoundEvent — shown as cwd. */
+    @Serializable
+    @SerialName("session.workspace_bound")
+    data class SessionWorkspaceBound(
+        val sessionId: SessionId,
+        val workspaceRoot: String,
+        override val sequence: Long,
+        override val sessionSequence: Long,
+    ) : ServerMessage, SessionMessage
+
     /**
      * Event-derived conversation turn (USER or ROUTER), from ChatTurnEvent. The client
      * rebuilds the chat transcript from these, ordered by [sessionSequence].