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>

cli.py

@@ -8163,27 +8163,6 @@ class HermesCLI:
             choices.append("view")
         return choices
 
-    def _computer_use_approval_callback(self, action: str, args: dict, summary: str) -> str:
-        """Adapt the generic approval UI for the computer_use tool.
-
-        The computer_use handler expects verdicts of the form
-        `approve_once` | `approve_session` | `always_approve` | `deny`.
-        The CLI's built-in approval UI returns `once` | `session` | `always`
-        | `deny`. Translate between the two.
-        """
-        # Build a command-ish string so the existing UI renders something
-        # meaningful. `summary` is already a one-line human description.
-        verdict = self._approval_callback(
-            command=f"computer_use: {summary}",
-            description=f"Allow computer_use to perform `{action}`?",
-        )
-        return {
-            "once": "approve_once",
-            "session": "approve_session",
-            "always": "always_approve",
-            "deny": "deny",
-        }.get(verdict, "deny")
-
     def _handle_approval_selection(self) -> None:
         """Process the currently selected dangerous-command approval choice."""
         state = self._approval_state
@@ -9370,16 +9349,6 @@ class HermesCLI:
         set_approval_callback(self._approval_callback)
         set_secret_capture_callback(self._secret_capture_callback)
 
-        # Computer-use shares the same approval UI (prompt_toolkit dialog).
-        # The tool handler expects a 3-arg callback (action, args, summary)
-        # and returns "approve_once" | "approve_session" | "always_approve"
-        # | "deny". Adapt our existing generic callback.
-        try:
-            from tools.computer_use_tool import set_approval_callback as _set_cu_cb
-            _set_cu_cb(self._computer_use_approval_callback)
-        except ImportError:
-            pass  # computer_use extras not installed
-
         # Ensure tirith security scanner is available (downloads if needed).
         # Warn the user if tirith is enabled in config but not available,
         # so they know command security scanning is degraded.