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>

website/docs/reference/skills-catalog.md

@@ -18,7 +18,6 @@ If a skill is missing from this list but present in the repo, the catalog is reg
 | [`apple-reminders`](/docs/user-guide/skills/bundled/apple/apple-apple-reminders) | Manage Apple Reminders via remindctl CLI (list, add, complete, delete). | `apple/apple-reminders` |
 | [`findmy`](/docs/user-guide/skills/bundled/apple/apple-findmy) | Track Apple devices and AirTags via FindMy.app on macOS using AppleScript and screen capture. | `apple/findmy` |
 | [`imessage`](/docs/user-guide/skills/bundled/apple/apple-imessage) | Send and receive iMessages/SMS via the imsg CLI on macOS. | `apple/imessage` |
-| [`macos-computer-use`](/docs/user-guide/skills/bundled/apple/apple-macos-computer-use) | Drive the macOS desktop in the background via the `computer_use` tool — screenshots, mouse, keyboard, scroll, drag — without stealing the user's cursor or keyboard focus. Works with any tool-capable model. | `apple/macos-computer-use` |
 
 ## autonomous-ai-agents