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.

docs/protocols/agent/api-endpoints.md

@@ -176,6 +176,8 @@ run 过滤语义：
 
 `/history` 会返回 tool 消息用于 UI 重建。tool 消息的 `ui_schema` 来自 `metadata.tool_agent_output.ui_hints` 的编译结果。
 
+补充说明：tool 消息若来自 `project_cli`，其 `metadata.tool_agent_output.tool_call_args` 内部形状以当前 CLI 协议为准。当前 canonical 结构为 `module/method/input`，调用方不得再假设存在 `skill/action/input` 或旧 `command/subcommand/args`。
+
 `messages[].content` 在当前协议中始终是字符串：
 
 - assistant: answer 文本