feat(agent): redesign project_cli with module/method/input protocol

- Replace command/subcommand/args with module/method/input envelope
- Calendar handler uses discriminated union (mode) for read operations
- Strict Pydantic models with extra='forbid' for all calendar methods
- Worker max_iters=7, router prompt simplified (removed project_cli_defaults)
- Skill index cards + per-action files for progressive disclosure
- Frontend/AG-UI aligned to module/method dispatch
- Protocol docs updated to module/method/input contract

WIP: action cards need envelope fix, 2 tests need update, memory
handler needs Pydantic models.

backend/tests/integration/test_agentscope_skill_prompt_flow.py

@@ -32,7 +32,9 @@ def test_react_agent_sys_prompt_includes_registered_skill_prompt() -> None:
     assert "# Agent Skills" in prompt
     assert "## calendar" in prompt
     assert "## contacts" in prompt
-    assert "SKILL.md" in prompt
+    assert "view_skill_file" in prompt
+    assert 'file_path="calendar/SKILL.md"' in prompt
+    assert 'file_path="contacts/SKILL.md"' in prompt
 
 
 def test_view_skill_file_tool_reads_registered_skill_content() -> None:
@@ -47,3 +49,18 @@ def test_view_skill_file_tool_reads_registered_skill_content() -> None:
     block = response.content[0]
     text = block["text"] if isinstance(block, dict) else block.text
     assert "Calendar Skill" in text or "name: calendar" in text
+
+
+def test_view_skill_file_tool_reads_calendar_action_card() -> None:
+    toolkit = build_toolkit(enabled_skill_names={"calendar"})
+    tool = toolkit.tools["view_skill_file"].original_func
+
+    response = asyncio.run(
+        tool(file_path="calendar/actions/create_event.md", ranges=[1, 20]),
+    )
+
+    assert response.content
+    block = response.content[0]
+    text = block["text"] if isinstance(block, dict) else block.text
+    assert "create_event" in text
+    assert "input.title" in text