feat(06-02): add /export command handler

- export_command handles /export and /export project
- Sends markdown as Telegram document attachment
- Registered in handlers/__init__.py
- Updated HELP_TEXT with export options

src/moai/bot/handlers/__init__.py

@@ -16,6 +16,7 @@ from moai.bot.handlers.discussion import (
     open_command,
     stop_command,
 )
+from moai.bot.handlers.export import export_command
 from moai.bot.handlers.projects import project_command, projects_command
 from moai.bot.handlers.status import status_command
 
@@ -44,6 +45,7 @@ def register_handlers(app: Application) -> None:
     app.add_handler(CommandHandler("next", next_command))
     app.add_handler(CommandHandler("stop", stop_command))
     app.add_handler(CommandHandler("consensus", consensus_command))
+    app.add_handler(CommandHandler("export", export_command))
 
     # @mention handler - MessageHandler registered AFTER CommandHandlers
     # Matches messages starting with @claude, @gpt, or @gemini followed by content

src/moai/bot/handlers/commands.py

@@ -28,7 +28,8 @@ Multi-AI collaborative brainstorming platform.
 
 *Output Commands:*
 /consensus - Generate consensus summary
-/export - Export project as markdown
+/export - Export current discussion as markdown
+/export project - Export entire project as markdown
 
 *Utility:*
 /status - Show current state

src/moai/bot/handlers/export.py

@@ -0,0 +1,85 @@
+"""Export command handlers for MoAI bot.
+
+Provides /export command to export discussions and projects as markdown documents.
+"""
+
+import io
+
+from telegram import Update
+from telegram.ext import ContextTypes
+
+from moai.core.exporter import export_discussion, export_project
+from moai.core.services.discussion import get_active_discussion, get_discussion, list_discussions
+from moai.core.services.project import get_project
+
+
+def get_selected_project(context: ContextTypes.DEFAULT_TYPE) -> str | None:
+    """Get the currently selected project ID from user data."""
+    return context.user_data.get("selected_project_id")
+
+
+async def export_command(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
+    """Handle /export command - export discussion or project as markdown.
+
+    Usage:
+        /export - Export current active discussion
+        /export project - Export entire project with all discussions
+    """
+    project_id = get_selected_project(context)
+    if not project_id:
+        await update.message.reply_text("No project selected. Use /project select first.")
+        return
+
+    project = await get_project(project_id)
+    if not project:
+        await update.message.reply_text("Selected project not found. Use /project select.")
+        return
+
+    args = context.args
+    export_full_project = args and args[0].lower() == "project"
+
+    if export_full_project:
+        # Export entire project
+        discussions_list = await list_discussions(project_id)
+        if not discussions_list:
+            await update.message.reply_text("No discussions in this project to export.")
+            return
+
+        # Fetch each discussion with full eager loading
+        loaded_discussions = []
+        for disc in discussions_list:
+            full_disc = await get_discussion(disc.id)
+            if full_disc:
+                loaded_discussions.append(full_disc)
+
+        markdown = export_project(project, loaded_discussions)
+        filename = f"{project.name.replace(' ', '_')}-export.md"
+
+        await update.message.reply_document(
+            document=io.BytesIO(markdown.encode("utf-8")),
+            filename=filename,
+            caption=f"📄 Full project export: {project.name}",
+        )
+    else:
+        # Export active discussion
+        discussion = await get_active_discussion(project_id)
+        if not discussion:
+            await update.message.reply_text(
+                "No active discussion. Start one with /open or /discuss."
+            )
+            return
+
+        # Re-fetch with full loading including consensus
+        full_discussion = await get_discussion(discussion.id)
+        if not full_discussion:
+            await update.message.reply_text("Failed to load discussion.")
+            return
+
+        markdown = export_discussion(full_discussion)
+        filename = f"{project.name.replace(' ', '_')}-discussion.md"
+
+        await update.message.reply_document(
+            document=io.BytesIO(markdown.encode("utf-8")),
+            filename=filename,
+            caption=f"📄 Discussion export: {full_discussion.question[:50]}...",
+        )