feat(permissions): voie projection CLI (LP0→LP3) + checkpoint Codex/input

Jalon vert regroupant deux chantiers entrelacés dans le working tree,
indissociables au niveau fichier mais tous deux verts (cargo test
--workspace + tests frontend permissions au vert).

Permissions — voie « projection CLI » (advisory), complète :
- LP0 domaine pur : modèle PermissionSet/EffectivePermissions, resolve
  deny-wins + postures Allow<Ask<Deny (crates/domain/src/permission.rs).
- LP1 store : FsPermissionStore (.ideai/permissions.json).
- LP2 use cases : Get/Update project, Update agent override, Resolve.
- LP3 projecteurs Claude/Codex (settings.local.json / config.toml),
  câblage launch-path + PermissionProjectorRegistry, nettoyage des
  fichiers Replace orphelins au swap de profil (LP3-4), composition root
  + commandes Tauri, UI PermissionsPanel (projet + override agent).
- ports.rs : PermissionStore + FileSystem::remove_file (cleanup au swap).

Reste ouvert (hors scope, marqué dans le code) : LP4 enforcement OS
airtight (Landlock fichiers) + résumé de permissions injecté.

Inclut aussi le chantier Codex/input/sessions structurées en cours
(McpConfigStrategy, StructuredAdapter, gestion d'input) partageant les
mêmes fichiers (lifecycle.rs, commands.rs, dto.rs, state.rs).

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

frontend/src/features/terminals/useWritePortal.ts

@@ -225,11 +225,20 @@ export function useWritePortal(
       },
       bindHandle(handle: TerminalHandle) {
         handleRef.current = handle;
+        // Tell the backend a frontend cell is now mounted for this agent, so the
+        // mediator routes its turns through `delegationReady` (this portal writes)
+        // rather than writing the PTY itself (the headless path for cell-less agents).
+        const agent = agentIdRef.current;
+        if (agent) void inputRef.current.setFrontAttached(agent, true).catch(() => {});
         // The PTY just became available — a queued delegation may be injectable.
         tryInject.current();
       },
       unbindHandle() {
         handleRef.current = null;
+        // The cell is gone — let the backend fall back to headless delivery so a
+        // delegation arriving while this agent has no live cell is not lost.
+        const agent = agentIdRef.current;
+        if (agent) void inputRef.current.setFrontAttached(agent, false).catch(() => {});
       },
     }),
     [],