revert: computer-use cua-driver (PR #16919) (#16927)

Reverts PR #16919 (commits dad10a78d, 413ee1a28, b4a8031b2, afb958829)
which was merged prematurely. Restoring the pre-merge state so #14817
and #15328 can be revisited as standing PRs.

Reverted commits:
- afb958829 fix(computer-use): harden image-rejection fallback + AUTHOR_MAP
- b4a8031b2 fix(computer-use): unwrap _multimodal tool results
- 413ee1a28 feat(computer-use): background focus-safe backend
- dad10a78d feat(computer-use): cua-driver backend, universal any-model schema

Co-authored-by: teknium1 <teknium@users.noreply.github.com>

toolsets.py

@@ -60,8 +60,6 @@ _HERMES_CORE_TOOLS = [
     "send_message",
     # Home Assistant smart home control (gated on HASS_TOKEN via check_fn)
     "ha_list_entities", "ha_get_state", "ha_list_services", "ha_call_service",
-    # Computer use (macOS, gated on cua-driver being installed via check_fn)
-    "computer_use",
 ]
 
 
@@ -92,17 +90,7 @@ TOOLSETS = {
         "tools": ["image_generate"],
         "includes": []
     },
-
-    "computer_use": {
-        "description": (
-            "Background macOS desktop control via cua-driver — screenshots, "
-            "mouse, keyboard, scroll, drag. Does NOT steal the user's cursor "
-            "or keyboard focus. Works with any tool-capable model."
-        ),
-        "tools": ["computer_use"],
-        "includes": []
-    },
-
+    
     "terminal": {
         "description": "Terminal/command execution and process management tools",
         "tools": ["terminal", "process"],