feat(03-02): implement /project select and /project info handlers

Add project selection and info display:
- /project select <id|name> stores selection in user_data
- /project info displays selected project details
- get_selected_project helper retrieves current project

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

src/moai/bot/handlers/projects.py

@@ -5,7 +5,13 @@ import re
 from telegram import Update
 from telegram.ext import ContextTypes
 
-from moai.core.services.project import create_project, list_projects
+from moai.core.models import Project
+from moai.core.services.project import (
+    create_project,
+    get_project,
+    get_project_by_name,
+    list_projects,
+)
 
 
 async def projects_command(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
@@ -49,6 +55,10 @@ async def project_command(update: Update, context: ContextTypes.DEFAULT_TYPE) ->
 
     if subcommand == "new":
         await _handle_project_new(update, context, args[1:])
+    elif subcommand == "select":
+        await _handle_project_select(update, context, args[1:])
+    elif subcommand == "info":
+        await _handle_project_info(update, context)
     else:
         await update.message.reply_text(
             f"Unknown subcommand: {subcommand}\nAvailable: new, select, delete, models, info"
@@ -84,3 +94,70 @@ async def _handle_project_new(
         f"Use /project select {project.id[:8]} to switch to this project.",
         parse_mode="Markdown",
     )
+
+
+async def _handle_project_select(
+    update: Update, context: ContextTypes.DEFAULT_TYPE, args: list[str]
+) -> None:
+    """Handle /project select <id|name> command."""
+    if not args:
+        await update.message.reply_text("Usage: /project select <id|name>")
+        return
+
+    identifier = " ".join(args)
+
+    # Try to find by ID first (supports partial ID match)
+    project = await get_project(identifier)
+
+    # If not found by ID, try by name
+    if project is None:
+        project = await get_project_by_name(identifier)
+
+    if project is None:
+        await update.message.reply_text(
+            "Project not found. Use /projects to list available projects."
+        )
+        return
+
+    # Store selected project ID in user_data
+    context.user_data["selected_project_id"] = project.id
+
+    await update.message.reply_text(f"Selected project: {project.name}")
+
+
+async def _handle_project_info(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
+    """Handle /project info 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
+
+    models_str = ", ".join(project.models) if project.models else "none"
+    # Note: discussion_count will be available when discussions are implemented
+    discussion_count = len(project.discussions) if project.discussions else 0
+
+    await update.message.reply_text(
+        f"*Project Info*\n\n"
+        f"Name: {project.name}\n"
+        f"ID: `{project.id}`\n"
+        f"Models: {models_str}\n"
+        f"Created: {project.created_at.strftime('%Y-%m-%d %H:%M')}\n"
+        f"Discussions: {discussion_count}",
+        parse_mode="Markdown",
+    )
+
+
+async def get_selected_project(context: ContextTypes.DEFAULT_TYPE) -> Project | None:
+    """Get the currently selected project from user_data.
+
+    Args:
+        context: The telegram context with user_data.
+
+    Returns:
+        The Project object if one is selected, None otherwise.
+    """
+    project_id = context.user_data.get("selected_project_id")
+    if project_id is None:
+        return None
+    return await get_project(project_id)