feat(mcp,orchestrator,frontend): tool idea_restart_self, redemarrage autonome d'un agent — #288 (tool core self-only via requester MCP handshake, retour immediat {restartId, status: scheduled} puis orchestration detachee: snapshot reprise, stop PTY/structured, liberation Busy/mailbox, relance LaunchAgent meme conversation_id fresh_start=false, injection interne invisible; events domain/wire agentRestartRequested/PhaseChanged/Completed/Failed phases stopping/releasingInput/launching/resuming; CLI custom: separateurs exacts redemarrage de l'agent + etat termine/echoue, deduplication (restartId, event), verrouillage composer; TUI native: overlay AgentRestartOverlay sans injection xterm, progress/annonces projetes jusqu'a idle; QA verte: mcp_server restart_self 1/1, restart-self 3/3, backend self_restart_contract + events wire 2/2, frontend 3 suites 92/92, npm build, cargo check --workspace, fmt --check, diff --check; reserves hors perimetre: web-server 103/110 fixture PTY preexistante, 34 echecs npm test globaux listProjectSettings/web hors #288; scripts/ hors perimetre)

crates/domain/src/orchestrator.rs

@@ -260,6 +260,13 @@ pub struct OrchestratorRequest {
 /// proof the request was well-formed (Parse, don't validate).
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum OrchestratorCommand {
+    /// Schedule a restart of the MCP requester itself.
+    RestartSelf {
+        /// Requesting agent, strictly parsed from the MCP handshake identity.
+        agent: AgentId,
+        /// Optional diagnostic reason. It is never used as an identity or target.
+        reason: Option<String>,
+    },
     /// Create the agent if unknown (with `profile` + optional initial context),
     /// then launch it — exactly as the UI would.
     SpawnAgent {
@@ -476,6 +483,15 @@ impl OrchestratorRequest {
     pub fn validate(&self) -> Result<OrchestratorCommand, OrchestratorError> {
         let action = self.action_name()?;
         match action {
+            "agent.restart_self" => Ok(OrchestratorCommand::RestartSelf {
+                agent: self.require_from(action)?,
+                reason: self
+                    .task
+                    .as_deref()
+                    .map(str::trim)
+                    .filter(|value| !value.is_empty())
+                    .map(str::to_owned),
+            }),
             "spawn_agent" => Ok(OrchestratorCommand::SpawnAgent {
                 name: self.require_name(action)?,
                 profile: Some(self.require("profile", action, self.profile.as_deref())?),