fix(orchestrator,plugins): contact cross-project corrélé + découvrabilité assignation plugin par agent — #284 (backend: registre des demandes actives clé projet/agent appelant + correlationId, refus corrélation vide/dupliquée, cancel routé après correspondance exacte sans redirection vers une autre cible, appelant projeté Waiting→Done dans le live-state de son propre projet avec correlationId exposé par idea_workstate_read, gardes RAII réconcilient l'abandon du futur, tools ask/cancel WriteAction deny-by-default dont le refus indique où activer la permission; frontend: action Attribuer aux agents depuis Settings projet > Plugins ouvrant le panneau Agents flottant/ancré/détaché, section Capabilities de plugins — {agent} explicitant attribution skills et tools MCP des plugins activés; QA verte: orchestrator_service 79/79, mcp_server 40/40, domain live_state 15/15, correlated_update_is_preserved_in_the_lean_projection 1/1, frontend ProjectPluginSettings 3 tests, npm run build frontend, cargo fmt --check, git diff --check; AppImage IdeA_0.3.0_amd64.AppImage rebuildée workflow build-appimage, validation live cross-project restant après remplacement/relance manuels; réserves: registre corrélation en mémoire non persisté, surface web unsupported, catalogue dynamique tools MCP = réserve #282)

crates/domain/src/live_state.rs

@@ -106,6 +106,9 @@ pub struct LiveEntry {
     pub progress: Option<String>,
     /// The ticket of the most recent delegation this agent issued, if any.
     pub last_delegation: Option<TicketId>,
+    /// External correlation carried by an active cross-project request, if any.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub correlation_id: Option<String>,
     /// Wall-clock update time in epoch milliseconds (drives `prune` ordering).
     pub updated_at_ms: u64,
 }
@@ -138,9 +141,35 @@ impl LiveEntry {
             status,
             progress,
             last_delegation,
+            correlation_id: None,
             updated_at_ms,
         })
     }
+
+    /// Attaches a validated external correlation id to this projection.
+    ///
+    /// Unlike human-readable preview fields, correlation ids are never truncated:
+    /// changing the value would make cancellation routing ambiguous.
+    pub fn with_correlation_id(
+        mut self,
+        correlation_id: Option<String>,
+    ) -> Result<Self, DomainError> {
+        if let Some(value) = correlation_id {
+            if value.trim().is_empty() {
+                return Err(DomainError::Invariant(
+                    "live-state correlation id must not be empty".to_owned(),
+                ));
+            }
+            if value.len() > FIELD_MAX_BYTES {
+                return Err(DomainError::Invariant(format!(
+                    "live-state correlation id exceeds the max size of {FIELD_MAX_BYTES} bytes ({} bytes)",
+                    value.len()
+                )));
+            }
+            self.correlation_id = Some(value);
+        }
+        Ok(self)
+    }
 }
 
 /// Enforces the field bounds: reject above the hard byte threshold, otherwise
@@ -224,6 +253,7 @@ impl LiveState {
                 status: WorkStatus::Idle,
                 progress: Some(STALE_AT_RESTART_MARKER.to_owned()),
                 last_delegation: None,
+                correlation_id: e.correlation_id.clone(),
                 updated_at_ms: now_ms,
             })
             .collect()