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>

pyproject.toml

@@ -61,11 +61,6 @@ honcho = ["honcho-ai>=2.0.1,<3"]
 mcp = ["mcp>=1.2.0,<2"]
 homeassistant = ["aiohttp>=3.9.0,<4"]
 sms = ["aiohttp>=3.9.0,<4"]
-# Computer use — macOS background desktop control via cua-driver (MCP stdio).
-# The cua-driver binary itself is installed via `hermes tools` post-setup
-# (curl install script); this extra just pins the MCP client used to talk
-# to it, which is already provided by the `mcp` extra.
-computer-use = ["mcp>=1.2.0,<2"]
 acp = ["agent-client-protocol>=0.9.0,<1.0"]
 mistral = ["mistralai>=2.3.0,<3"]
 bedrock = ["boto3>=1.35.0,<2"]