feat: integrate GitHub Copilot providers across Hermes

Add first-class GitHub Copilot and Copilot ACP provider support across
model selection, runtime provider resolution, CLI sessions, delegated
subagents, cron jobs, and the Telegram gateway.

This also normalizes Copilot model catalogs and API modes, introduces a
Copilot ACP OpenAI-compatible shim, and fixes service-mode auth by
resolving Homebrew-installed gh binaries under launchd.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tests/test_run_agent.py

@@ -631,6 +631,28 @@ class TestBuildApiKwargs:
         kwargs = agent._build_api_kwargs(messages)
         assert kwargs["extra_body"]["reasoning"]["effort"] == "medium"
 
+    def test_reasoning_sent_for_copilot_gpt5(self, agent):
+        agent.base_url = "https://api.githubcopilot.com"
+        agent.model = "gpt-5.4"
+        messages = [{"role": "user", "content": "hi"}]
+        kwargs = agent._build_api_kwargs(messages)
+        assert kwargs["extra_body"]["reasoning"] == {"effort": "medium"}
+
+    def test_reasoning_xhigh_normalized_for_copilot(self, agent):
+        agent.base_url = "https://api.githubcopilot.com"
+        agent.model = "gpt-5.4"
+        agent.reasoning_config = {"enabled": True, "effort": "xhigh"}
+        messages = [{"role": "user", "content": "hi"}]
+        kwargs = agent._build_api_kwargs(messages)
+        assert kwargs["extra_body"]["reasoning"] == {"effort": "high"}
+
+    def test_reasoning_omitted_for_non_reasoning_copilot_model(self, agent):
+        agent.base_url = "https://api.githubcopilot.com"
+        agent.model = "gpt-4.1"
+        messages = [{"role": "user", "content": "hi"}]
+        kwargs = agent._build_api_kwargs(messages)
+        assert "reasoning" not in kwargs.get("extra_body", {})
+
     def test_max_tokens_injected(self, agent):
         agent.max_tokens = 4096
         messages = [{"role": "user", "content": "hi"}]
@@ -2172,6 +2194,41 @@ class TestFallbackAnthropicProvider:
         assert agent.client is mock_client
 
 
+def test_aiagent_uses_copilot_acp_client():
+    with (
+        patch("run_agent.get_tool_definitions", return_value=_make_tool_defs("web_search")),
+        patch("run_agent.check_toolset_requirements", return_value={}),
+        patch("run_agent.OpenAI") as mock_openai,
+        patch("agent.copilot_acp_client.CopilotACPClient") as mock_acp_client,
+    ):
+        acp_client = MagicMock()
+        mock_acp_client.return_value = acp_client
+
+        agent = AIAgent(
+            api_key="copilot-acp",
+            base_url="acp://copilot",
+            provider="copilot-acp",
+            acp_command="/usr/local/bin/copilot",
+            acp_args=["--acp", "--stdio"],
+            quiet_mode=True,
+            skip_context_files=True,
+            skip_memory=True,
+        )
+
+    assert agent.client is acp_client
+    mock_openai.assert_not_called()
+    mock_acp_client.assert_called_once()
+    assert mock_acp_client.call_args.kwargs["base_url"] == "acp://copilot"
+    assert mock_acp_client.call_args.kwargs["api_key"] == "copilot-acp"
+    assert mock_acp_client.call_args.kwargs["command"] == "/usr/local/bin/copilot"
+    assert mock_acp_client.call_args.kwargs["args"] == ["--acp", "--stdio"]
+
+
+def test_is_openai_client_closed_honors_custom_client_flag():
+    assert AIAgent._is_openai_client_closed(SimpleNamespace(is_closed=True)) is True
+    assert AIAgent._is_openai_client_closed(SimpleNamespace(is_closed=False)) is False
+
+
 class TestAnthropicBaseUrlPassthrough:
     """Bug fix: base_url was filtered with 'anthropic in base_url', blocking proxies."""