feat(bot,bridge): P1 !auto 토글 자동승인 + P2 BridgeTransport 추상화 #task-304 #task-305

P1: !auto 토글 (bot.py + extension.ts)
- auto_approve_projects set으로 프로젝트별 상태 관리
- !auto → on/off 토글, pending 자동 승인 + 🤖 자동 승인됨 embed
- Extension step_probe에서 autoApproveEnabled 시 직접 tryApprovalStrategies

P2: BridgeTransport 추상화 (bridge.py)
- BridgeTransport ABC + LocalTransport (기존 동작 100% 호환)
- RemoteTransport 스켈레톤 (multi-PC 대비)
- config.py BOT_MODE/REMOTE_BRIDGE_URL, main.py transport 주입

docs: usage-guide.md + tech-stack.md Python 경로 기록

bot.py

@@ -179,6 +179,7 @@ class GravityBot(commands.Bot):
         self.bridge = BridgeProtocol()
         self.session_category: discord.CategoryChannel | None = None
         self.guild: discord.Guild | None = None
+        self.auto_approve_projects: set[str] = set()  # projects with auto-approve enabled
 
     @staticmethod
     def _make_channel_name(project_name: str) -> str:
@@ -211,12 +212,18 @@ class GravityBot(commands.Bot):
             )
 
         @self.tree.command(name="auto", description="자동 승인 토글")
-        async def slash_auto(interaction: discord.Interaction, mode: str):
+        async def slash_auto(interaction: discord.Interaction):
             project = self.channel_to_project.get(interaction.channel_id)
             if not project:
                 await interaction.response.send_message("⚠️ 프로젝트 채널이 아닙니다.", ephemeral=True)
                 return
-            enabled = mode.lower() in ("on", "true", "1")
+            # Toggle
+            if project in self.auto_approve_projects:
+                self.auto_approve_projects.discard(project)
+                enabled = False
+            else:
+                self.auto_approve_projects.add(project)
+                enabled = True
             self.bridge.write_command(project, f"!auto {'on' if enabled else 'off'}", project_name=project)
             emoji = "🟢" if enabled else "🔴"
             await interaction.response.send_message(
@@ -521,6 +528,35 @@ class GravityBot(commands.Bot):
                 if req.discord_message_id != 0:
                     continue
 
+                # Learn project mapping from pending approval
+                project = req.project_name or Config.PROJECT_NAME
+                if req.conversation_id and req.conversation_id != '__global__':
+                    self.conv_to_project[req.conversation_id] = project
+
+                # ── Auto-approve: if project has auto enabled, approve immediately ──
+                if project in self.auto_approve_projects:
+                    self._sent_approval_ids.add(req.request_id)
+                    # Write auto-approve response for Extension
+                    self.bridge.write_response(UserResponse(
+                        request_id=req.request_id,
+                        approved=True,
+                        button_index=0,  # first button (Allow Once / Run)
+                        step_type=getattr(req, 'step_type', ''),
+                        project_name=project,
+                    ))
+                    # Show compact auto-approved embed in Discord
+                    channel = await self._get_channel(project)
+                    if channel:
+                        embed = discord.Embed(
+                            title="🤖 자동 승인됨",
+                            description=f"```\n{req.command[:500]}\n```",
+                            color=discord.Color.green(),
+                        )
+                        embed.set_footer(text=f"auto-approve | {req.request_id[:12]}")
+                        await channel.send(embed=embed)
+                    logger.info(f"Auto-approved: {req.request_id[:12]} project={project}")
+                    continue
+
                 # Defer short-command pendings (e.g. "Run") by 4 cycles (~12s)
                 # to give step_probe time to merge detailed command info
                 # (step_probe MERGE happens ~10s after pending creation)
@@ -540,11 +576,6 @@ class GravityBot(commands.Bot):
                 # Clean up defer tracking
                 self._deferred_ids.pop(req.request_id, None)
 
-                # Learn project mapping from pending approval
-                project = req.project_name or Config.PROJECT_NAME
-                if req.conversation_id and req.conversation_id != '__global__':
-                    self.conv_to_project[req.conversation_id] = project
-
                 channel = await self._get_channel(project)
                 if channel:
                     self._sent_approval_ids.add(req.request_id)
@@ -732,17 +763,22 @@ class GravityBot(commands.Bot):
             await message.channel.send(embed=embed)
             return
 
-        # Special command: !auto on/off
-        if text in ("!auto on", "!auto off"):
-            self.bridge.write_command(project, text, project_name=project)
-            enabled = text == "!auto on"
+        # Special command: !auto — toggle auto-approve
+        if text == "!auto":
+            # Toggle per-project auto-approve
+            if project in self.auto_approve_projects:
+                self.auto_approve_projects.discard(project)
+                enabled = False
+            else:
+                self.auto_approve_projects.add(project)
+                enabled = True
+            self.bridge.write_command(project, f"!auto {'on' if enabled else 'off'}", project_name=project)
             emoji = "🟢" if enabled else "🔴"
             mode = "자동 승인" if enabled else "수동 승인"
             embed = discord.Embed(
                 title=f"{emoji} {mode} 모드",
                 description=f"프로젝트: **{project}**\n"
-                            f"`chat.tools.autoApprove = {enabled}`\n"
-                            f"`chat.agent.autoApprove = {enabled}`",
+                            f"모든 승인 요청이 {'자동으로 승인됩니다' if enabled else '수동 확인이 필요합니다'}",
                 color=discord.Color.green() if enabled else discord.Color.red(),
             )
             await message.channel.send(embed=embed)