rename agent_type 'acp' to 'acp-claude' for consistency

Aligns naming with 'acp-codex': both now follow the
acp-{provider} pattern, making the agent type self-documenting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: simonrosenberg

.github/workflows/run-eval.yml

@@ -102,14 +102,14 @@ on:
             agent_type:
                 description: >-
                     Agent type: 'default' for standard Agent,
-                    'acp' for ACPAgent with Claude Code,
+                    'acp-claude' for ACPAgent with Claude Code,
                     'acp-codex' for ACPAgent with Codex.
                 required: false
                 default: default
                 type: choice
                 options:
                     - default
-                    - acp
+                    - acp-claude
                     - acp-codex