Fix documentation inconsistencies found by code audit

- docs/01: sync all syscall signatures with proto (missing params,
  invented callback params, stream semantics, return types)
- docs/02: mark unimplemented features (FFI system plugins, topo sort,
  lifecycle CLI, watchdog); clarify plugin.yaml is not parsed by the
  kernel - registration goes through gRPC PluginBridge.Register;
  correct permission model and session_id descriptions
- docs/03: check off implemented stage 3 items (Hermes adapter,
  Claude Code plugin)
- docs/04: data/ actual location, add Cargo.toml to plugin trees,
  note __init__.py is hand-maintained
- README: status line now reflects actual progress

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/01-内核系统调用.md

@@ -12,7 +12,7 @@ agentsd 定义 9 个 syscall 接口。类比 Linux 内核 syscall 表——接
 
 ```
 display.text(content)
-display.rich(markup)
+display.rich(markup, format)
 display.image(data, format)
 display.clear()
 display.notify(message)
@@ -27,12 +27,12 @@ display.notify(message)
 **管**:扬声器输出、麦克风输入 | **不管**:TTS/STT(插件的事)
 
 ```
-audio.play(data, format)
+audio.play(stream AudioChunk{data, format})   # 客户端流式上传音频帧
 audio.stop()
 audio.volume(level)
-audio.record.start(format)
-audio.record.stop() -> data
-audio.record.stream(callback)
+audio.record_start(format)
+audio.record_stop() -> data
+audio.record_stream(format) -> stream AudioChunk  # 服务端流式返回录音帧
 ```
 
 ---
@@ -44,13 +44,13 @@ audio.record.stream(callback)
 **管**:磁盘文件 | **不管**:结构化数据(Memory)
 
 ```
-fs.read(path) -> data
-fs.write(path, data)
+fs.read(path, offset?, length?) -> data
+fs.write(path, data, append?)
 fs.delete(path)
 fs.rename(from, to)
 fs.stat(path) -> metadata
 fs.list(dir) -> entries
-fs.watch(path, callback)
+fs.watch(path) -> stream FsWatchEvent{path, kind}
 ```
 
 ---
@@ -65,8 +65,8 @@ fs.watch(path, callback)
 memory.read(key) -> value
 memory.write(key, value)
 memory.delete(key)
-memory.list(prefix?) -> keys
-memory.search(query) -> results
+memory.list(prefix?, limit?) -> keys
+memory.search(query, limit?) -> results
 ```
 
 ---
@@ -99,13 +99,13 @@ gRPC 流式语义:OpenConn/Listen 返回 `stream ConnEvent{conn_id, data, kind}`
 **管**:子进程生命周期、stdio | **不管**:插件间路由(内核调度)
 
 ```
-proc.spawn(cmd, args, env?) -> pid
+proc.spawn(cmd, args, env?, cwd?) -> pid
 proc.kill(pid)
 proc.wait(pid) -> exitcode
 proc.stdin(pid, data)
-proc.stdout(pid) -> data
+proc.stdout(pid) -> stream DataChunk          # 服务端流式输出
 proc.signal(pid, sig)
-proc.list() -> [pid]
+proc.list() -> [ProcInfo{pid, cmd, status}]
 ```
 
 ---
@@ -134,10 +134,10 @@ timer.now() -> timestamp
 **管**:屏幕读取、输入模拟 | **不管**:向用户展示(Display)、用户主动输入(Input)
 
 ```
-hid.capture(region?) -> image
-hid.mouse(x, y, action)
-hid.keyboard(key, action)
-hid.ocr(region?) -> text
+hid.capture(x, y, width, height) -> image
+hid.mouse(x, y, action, button)
+hid.keyboard(key, action, modifiers?)
+hid.ocr(x, y, width, height) -> text
 ```
 
 ---
@@ -152,7 +152,7 @@ hid.ocr(region?) -> text
 input.text() -> string
 input.key() -> keyevent
 input.clipboard() -> data
-input.event() -> event
+input.events() -> stream InputEvent           # 服务端流式事件
 ```
 
 ---