fix(domain,application,infrastructure): borne le namespace MCP plugin à 64 chars pour Codex/OpenAI — #333 (QA verte)

Cause racine: PluginMcpServerSpec::client_name() encodait chaque octet
non alphanumérique en _XX, produisant pour UnitySoundTool
`idea_plugin__com_2eidea_2eunity_2ddeveloper_2dtools__unity_2ddeveloper_2dtools_2etools`
(86 chars). Codex préfixe `mcp__` => 91 chars, limite API 64 => HTTP 400
`Invalid input.namespace string too long` sur chaque `codex exec resume`
dont l'historique contenait un outil Unity, aucun agent_message, UI en
fallback générique « réponse non finalisée ».

- domain: client_name() borné à 59 bytes ASCII (=> 64 avec mcp__) —
  stem lisible (minuscules, non-alnum => '_', tronqué) + suffixe
  déterministe = 16 premiers hex de SHA-256(plugin_id + NUL + server_id)
  pour conserver la résistance aux collisions après troncature; tests
  Unity (59 exact), stabilité, slug ponctuation, collisions sur stems
  tronqués identiques
- application: tests de projection TOML/JSON Codex et Claude adaptés au
  vrai namespace legacy encodé (86 chars) — vérifie que les tables
  utilisateur (mcp_servers.user_server, user-server) sont préservées
  pendant le retrait des tables managées périmées
- infrastructure: parse_event Codex traite turn.failed/error comme
  ReplyEvent::Error avec le message fournisseur (fini le fallback
  générique muet), classification lisible MCP_NAMESPACE_TOO_LONG: pour
  les erreurs de longueur de namespace; tests

Après déploiement: nouvelle conversation/restart requis pour les agents
Codex existants — les historiques contiennent déjà le namespace
invalide. Aucun push.

crates/application/src/agent/lifecycle.rs

@@ -5581,9 +5581,9 @@ mod tests {
     #[test]
     fn codex_plugin_server_projection_removes_stale_managed_tables() {
         let current = assigned_plugin_server();
-        let stale = "idea_plugin__stale__server";
+        let stale = "idea_plugin__com_2eidea_2eunity_2ddeveloper_2dtools__unity_2ddeveloper_2dtools_2etools";
         let existing = format!(
-            "user_key = \"keep\"\n[mcp_servers.\"{stale}\"]\ncommand = \"old\"\n\n[preview]\nenabled = true\n"
+            "user_key = \"keep\"\n[mcp_servers.user_server]\ncommand = \"user\"\n\n[mcp_servers.\"{stale}\"]\ncommand = \"old\"\n\n[preview]\nenabled = true\n"
         );
         let declaration = codex_mcp_declaration(
             domain::profile::McpTransport::Stdio,
@@ -5593,6 +5593,7 @@ mod tests {
         let rendered = codex_config_toml(Some(&existing), &declaration, "/run", "/project");
         assert!(!rendered.contains(stale));
         assert!(rendered.contains("user_key = \"keep\""));
+        assert!(rendered.contains("[mcp_servers.user_server]\ncommand = \"user\""));
         assert!(rendered.contains("[preview]\nenabled = true"));
         assert_eq!(rendered.matches(&current.client_name()).count(), 1);
     }
@@ -5600,10 +5601,12 @@ mod tests {
     #[test]
     fn internal_restart_refreshes_plugin_servers_without_replacing_real_idea_wiring() {
         let current = assigned_plugin_server();
+        let stale = "idea_plugin__com_2eidea_2eunity_2ddeveloper_2dtools__unity_2ddeveloper_2dtools_2etools";
         let existing_json = br#"{
           "mcpServers": {
             "idea": { "command": "/opt/Idea.AppImage", "args": ["mcp-server", "--endpoint", "/live.sock"] },
-            "idea_plugin__stale__server": { "command": "old" }
+            "user-server": { "command": "user" },
+            "idea_plugin__com_2eidea_2eunity_2ddeveloper_2dtools__unity_2ddeveloper_2dtools_2etools": { "command": "old" }
           }
         }"#;
         let claude = reconcile_plugin_mcp_json(existing_json, std::slice::from_ref(&current))
@@ -5613,18 +5616,18 @@ mod tests {
             claude["mcpServers"]["idea"]["command"],
             "/opt/Idea.AppImage"
         );
-        assert!(claude["mcpServers"]
-            .get("idea_plugin__stale__server")
-            .is_none());
+        assert!(claude["mcpServers"].get(stale).is_none());
+        assert_eq!(claude["mcpServers"]["user-server"]["command"], "user");
         assert_eq!(
             claude["mcpServers"][current.client_name()]["command"],
             current.command
         );
 
-        let existing_toml = "[mcp_servers.idea]\ncommand = \"/opt/Idea.AppImage\"\nargs = [\"mcp-server\", \"--endpoint\", \"/live.sock\"]\n\n[mcp_servers.\"idea_plugin__stale__server\"]\ncommand = \"old\"\n";
-        let codex = merge_codex_plugin_mcp_tables(existing_toml, std::slice::from_ref(&current));
+        let existing_toml = format!("[mcp_servers.idea]\ncommand = \"/opt/Idea.AppImage\"\nargs = [\"mcp-server\", \"--endpoint\", \"/live.sock\"]\n\n[mcp_servers.user_server]\ncommand = \"user\"\n\n[mcp_servers.\"{stale}\"]\ncommand = \"old\"\n");
+        let codex = merge_codex_plugin_mcp_tables(&existing_toml, std::slice::from_ref(&current));
         assert!(codex.contains("command = \"/opt/Idea.AppImage\""));
-        assert!(!codex.contains("idea_plugin__stale__server"));
+        assert!(codex.contains("[mcp_servers.user_server]\ncommand = \"user\""));
+        assert!(!codex.contains(stale));
         assert!(codex.contains(&current.client_name()));
     }
 

crates/application/src/project_plugin.rs

@@ -910,7 +910,7 @@ mod tests {
         let server = &servers[0];
         assert_eq!(
             server.client_name(),
-            "idea_plugin__com_2eidea_2eunity_2dtools__unity_2deditor"
+            "idea_plugin__com_idea_unity_tools__unity___904dacd241fbd4e7"
         );
         assert_eq!(server.command, "/plugins/unity/bin/server");
         assert_eq!(