feat(03-03): implement /project models and /project delete handlers

- /project models [list] - show/set AI models for current project
- /project delete <id> - delete project by ID with confirmation
- Clear user selection if deleted project was selected

M2 milestone complete: full project CRUD via Telegram.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/moai/bot/handlers/projects.py

@@ -8,9 +8,11 @@ from telegram.ext import ContextTypes
 from moai.core.models import Project
 from moai.core.services.project import (
     create_project,
+    delete_project,
     get_project,
     get_project_by_name,
     list_projects,
+    update_project_models,
 )
 
 
@@ -35,10 +37,10 @@ async def project_command(update: Update, context: ContextTypes.DEFAULT_TYPE) ->
 
     Subcommands:
         new "Name" - Create new project
-        select <id|name> - Switch to project (future)
+        select <id|name> - Switch to project
-        delete <id> - Delete project (future)
+        delete <id> - Delete project by ID
-        models <list> - Set models (future)
+        models <list> - Set models for current project
-        info - Show current project (future)
+        info - Show current project
     """
     args = context.args or []
 
@@ -46,8 +48,10 @@ async def project_command(update: Update, context: ContextTypes.DEFAULT_TYPE) ->
         await update.message.reply_text(
             "Usage:\n"
             '/project new "Name" - Create project\n'
-            "/project select <id> - Switch project\n"
+            "/project select <id|name> - Switch project\n"
-            "/project info - Show current project"
+            "/project info - Show current project\n"
+            "/project models [model1,model2,...] - Set/show models\n"
+            "/project delete <id> - Delete project"
         )
         return
 
@@ -59,9 +63,13 @@ async def project_command(update: Update, context: ContextTypes.DEFAULT_TYPE) ->
         await _handle_project_select(update, context, args[1:])
     elif subcommand == "info":
         await _handle_project_info(update, context)
+    elif subcommand == "models":
+        await _handle_project_models(update, context, args[1:])
+    elif subcommand == "delete":
+        await _handle_project_delete(update, context, args[1:])
     else:
         await update.message.reply_text(
-            f"Unknown subcommand: {subcommand}\nAvailable: new, select, delete, models, info"
+            f"Unknown subcommand: {subcommand}\nAvailable: new, select, info, models, delete"
         )
 
 
@@ -148,6 +156,72 @@ async def _handle_project_info(update: Update, context: ContextTypes.DEFAULT_TYP
     )
 
 
+async def _handle_project_models(
+    update: Update, context: ContextTypes.DEFAULT_TYPE, args: list[str]
+) -> None:
+    """Handle /project models [model1,model2,...] command."""
+    project = await get_selected_project(context)
+
+    if project is None:
+        await update.message.reply_text("No project selected. Use /project select <name> first.")
+        return
+
+    # No args: show current models
+    if not args:
+        models_str = ", ".join(project.models) if project.models else "none"
+        await update.message.reply_text(f"Current models: {models_str}")
+        return
+
+    # Parse comma-separated model names
+    models_input = " ".join(args)
+    models = [m.strip() for m in models_input.split(",") if m.strip()]
+
+    if not models:
+        await update.message.reply_text("Usage: /project models claude,gpt,gemini")
+        return
+
+    updated_project = await update_project_models(project.id, models)
+
+    if updated_project is None:
+        await update.message.reply_text("Project not found.")
+        return
+
+    models_str = ", ".join(updated_project.models)
+    await update.message.reply_text(f"Models updated: {models_str}")
+
+
+async def _handle_project_delete(
+    update: Update, context: ContextTypes.DEFAULT_TYPE, args: list[str]
+) -> None:
+    """Handle /project delete <id> command."""
+    if not args:
+        await update.message.reply_text("Usage: /project delete <project-id>")
+        return
+
+    project_id = args[0]
+
+    # Get project first to show name in confirmation
+    project = await get_project(project_id)
+
+    if project is None:
+        await update.message.reply_text("Project not found.")
+        return
+
+    project_name = project.name
+
+    deleted = await delete_project(project_id)
+
+    if not deleted:
+        await update.message.reply_text("Project not found.")
+        return
+
+    # Clear selection if deleted project was selected
+    if context.user_data.get("selected_project_id") == project_id:
+        context.user_data.pop("selected_project_id", None)
+
+    await update.message.reply_text(f"Deleted project: {project_name}")
+
+
 async def get_selected_project(context: ContextTypes.DEFAULT_TYPE) -> Project | None:
     """Get the currently selected project from user_data.