feat: add default permission mode + rename accept→edit

- Add "default" permission mode: no flags passed to CC, uses its own
  built-in default (asks about everything). Now the system default.
- Rename "accept" alias to "edit" (acceptEdits) for clarity
- Remove "skip" alias (duplicate of "bypass")
- Update all help text, error messages, tests, and LLM prompts

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

bot/commands.py

@@ -20,14 +20,15 @@ logger = logging.getLogger(__name__)
 
 # Permission mode aliases (user-facing shorthand → internal CC mode)
 _PERM_ALIASES: dict[str, str] = {
-    "bypass": "bypassPermissions",
-    "skip":   "bypassPermissions",
-    "accept": "acceptEdits",
-    "plan":   "plan",
+    "bypass":  "bypassPermissions",
+    "default": "default",
+    "edit":    "acceptEdits",
+    "plan":    "plan",
 }
 _PERM_LABELS: dict[str, str] = {
+    "default":           "default",
     "bypassPermissions": "bypass",
-    "acceptEdits":       "accept",
+    "acceptEdits":       "edit",
     "plan":              "plan",
 }
 
@@ -113,14 +114,14 @@ async def handle_command(user_id: str, text: str) -> Optional[str]:
 async def _cmd_new(user_id: str, args: str) -> str:
     """Create a new session."""
     if not args:
-        return "Usage: /new <project_dir> [initial_message] [--timeout N] [--perm MODE]\nModes: bypass (default), accept, plan"
+        return "Usage: /new <project_dir> [initial_message] [--timeout N] [--perm MODE]\nModes: default, edit, plan, bypass"
 
     parser = argparse.ArgumentParser()
     parser.add_argument("working_dir", nargs="?", help="Project directory")
     parser.add_argument("rest", nargs="*", help="Initial message")
     parser.add_argument("--timeout", type=int, default=None, help="CC timeout in seconds")
     parser.add_argument("--idle", type=int, default=None, help="Idle timeout in seconds")
-    parser.add_argument("--perm", default=None, help="Permission mode: bypass, accept, plan")
+    parser.add_argument("--perm", default=None, help="Permission mode: default, edit, plan, bypass")
 
     try:
         parsed = parser.parse_args(args.split())
@@ -132,7 +133,7 @@ async def _cmd_new(user_id: str, args: str) -> str:
 
     permission_mode = _resolve_perm(parsed.perm) if parsed.perm else DEFAULT_PERMISSION_MODE
     if permission_mode is None:
-        return f"Invalid --perm. Valid modes: bypass, accept, plan"
+        return f"Invalid --perm. Valid modes: default, edit, plan, bypass"
 
     working_dir = parsed.working_dir
     initial_msg = " ".join(parsed.rest) if parsed.rest else None
@@ -288,10 +289,11 @@ async def _cmd_perm(user_id: str, args: str) -> str:
     if not parts:
         return (
             "Usage: /perm <mode> [conv_id]\n"
-            "Modes: bypass (default), accept, plan\n"
-            "  bypass — skip all permission checks\n"
-            "  accept — auto-accept file edits, confirm shell commands\n"
-            "  plan   — plan only, no writes"
+            "Modes: default, edit, plan, bypass\n"
+            "  default — default mode\n"
+            "  edit — auto-accept file edits, confirm shell commands\n"
+            "  plan   — plan only, no writes\n"
+            "  bypass — skip all permission checks"
         )
 
     alias = parts[0]
@@ -299,7 +301,7 @@ async def _cmd_perm(user_id: str, args: str) -> str:
 
     permission_mode = _resolve_perm(alias)
     if permission_mode is None:
-        return f"Unknown mode '{alias}'. Valid: bypass, accept, plan"
+        return f"Unknown mode '{alias}'. Valid: default, edit, plan, bypass"
 
     if not conv_id:
         return "No active session. Use `//perm <mode> <conv_id>` or activate a session first."
@@ -442,7 +444,7 @@ def _cmd_help() -> str:
 {P}status - Show sessions and current mode
 {P}close [n] - Close session (active or by number)
 {P}switch <n> - Switch to session by number
-{P}perm <mode> [conv_id] - Set permission mode (bypass/accept/plan)
+{P}perm <mode> [conv_id] - Set permission mode (default/edit/plan/bypass)
 {P}direct - Direct mode: messages → Claude Code (no LLM overhead)
 {P}smart - Smart mode: messages → LLM routing (default)
 {P}shell <cmd> - Run shell command (bypasses LLM)
@@ -454,9 +456,10 @@ def _cmd_help() -> str:
 {P}help - Show this help
 
 **Permission modes** (used by {P}perm and {P}new --perm):
-  bypass — 跳过所有权限确认，CC 自动执行一切操作（默认）
-            适合：受信任的沙盒环境、自动化任务
-  accept — 自动接受文件编辑，但 shell 命令仍需手动确认
+  default — 默认模式，遇到文件编辑操作时手动确认
+  edit — 自动接受文件编辑，但 shell 命令仍需手动确认
             适合：日常开发，需要对命令执行保持控制
   plan   — 只规划、不执行任何写操作
-            适合：先预览 CC 的操作计划再决定是否执行"""
+            适合：先预览 CC 的操作计划再决定是否执行
+  bypass — 跳过所有权限确认，CC 自动执行一切操作
+            适合：受信任的沙盒环境、自动化任务"""