feat: Discord slash commands /stop /auto /send with guild sync

bot.py

@@ -115,8 +115,59 @@ class GravityBot(commands.Bot):
         self.loop.create_task(self._process_events())
         self.pending_approval_scanner.start()
         self.chat_snapshot_scanner.start()
+        self._register_slash_commands()
         logger.info("Bot setup complete")
 
+    def _register_slash_commands(self):
+        """Register Discord slash commands."""
+
+        @self.tree.command(name="stop", description="AI 작업 중지")
+        async def slash_stop(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
+            self.bridge.write_command(project, "!stop", project_name=project)
+            await interaction.response.send_message(
+                embed=discord.Embed(
+                    title="⏹️ AI 작업 중지",
+                    description=f"**{project}** IDE에 중지 요청 전달됨",
+                    color=discord.Color.orange(),
+                )
+            )
+
+        @self.tree.command(name="auto", description="자동 승인 토글")
+        async def slash_auto(interaction: discord.Interaction, mode: str):
+            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")
+            self.bridge.write_command(project, f"!auto {'on' if enabled else 'off'}", project_name=project)
+            emoji = "🟢" if enabled else "🔴"
+            await interaction.response.send_message(
+                embed=discord.Embed(
+                    title=f"{emoji} {'자동 승인' if enabled else '수동 승인'} 모드",
+                    description=f"프로젝트: **{project}**",
+                    color=discord.Color.green() if enabled else discord.Color.red(),
+                )
+            )
+
+        @self.tree.command(name="send", description="IDE 채팅에 메시지 전송")
+        async def slash_send(interaction: discord.Interaction, message: str):
+            project = self.channel_to_project.get(interaction.channel_id)
+            if not project:
+                await interaction.response.send_message("⚠️ 프로젝트 채널이 아닙니다.", ephemeral=True)
+                return
+            self.bridge.write_command(project, message, project_name=project)
+            await interaction.response.send_message(
+                embed=discord.Embed(
+                    description=f"📨 → **{project}** IDE에 전달됨\n`{message[:100]}`",
+                    color=discord.Color.blurple(),
+                ),
+                delete_after=10,
+            )
+
     async def on_ready(self):
         logger.info(f"Bot connected as {self.user} (ID: {self.user.id})")
 
@@ -144,6 +195,14 @@ class GravityBot(commands.Bot):
         # Load conversation → project registrations from Extension
         self._load_registrations()
 
+        # Sync slash commands to guild
+        try:
+            self.tree.copy_global_to(guild=self.guild)
+            synced = await self.tree.sync(guild=self.guild)
+            logger.info(f"Synced {len(synced)} slash commands to guild")
+        except Exception as e:
+            logger.warning(f"Slash command sync failed: {e}")
+
         # Open the gate
         self._ready_event.set()
         logger.info("Ready gate opened — event processing enabled")