fix(acp): drop speculative claude-code-acp marker

Only two mentions of "claude-code-acp" exist in-tree, both in comments
about the v0.1.x stdout-log quirk — nobody installs or launches a
package by that name today. Keep the map to actually-shipping servers.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Debug Agent

openhands-sdk/openhands/sdk/agent/acp_agent.py

@@ -155,7 +155,6 @@ def _make_dummy_llm() -> LLM:
 #     src/thread.rs: build_prompt_items() image → UserInput::Image
 _ACP_VISION_PROVIDER_MARKERS: dict[str, bool] = {
     "claude-agent-acp": True,
-    "claude-code-acp": True,  # legacy name, kept for completeness
     "gemini-cli": True,
     "codex-acp": True,
 }