feat: add Telegram file attachment support (inbound + outbound)

Inbound:
- tg-ingest detects document/photo/audio/video/voice attachments
- Downloads files via Telegram Bot API (getFile + download)
- Inlines small text files (<50KB) directly in the prompt
- Stores binary/large files to S3 (attachments/{chat_id}/{update_id}/{filename})
- agent-runner appends file context to the AgentCore prompt

Outbound:
- New send_file tool for the agent to send documents back to users
- TelegramAdapter.send_document uses multipart/form-data POST
- CDK grants tg-ingest S3 write access and passes bucket name env var

agentclaw/app/agent_claw_main/main.py

@@ -17,6 +17,7 @@ from tools.scheduler import schedule_reminder, list_reminders, cancel_reminder
 import tools.scheduler as _scheduler_module
 from tools.home_assistant import home_assistant, set_ha_config
 from tools.google_workspace import list_calendars, get_calendar_events, list_gmail_messages, get_gmail_message
+from tools.send_file import send_file as _send_file_impl
 import tools.google_workspace as _gws
 import httpx
 import botocore.auth
@@ -74,6 +75,19 @@ def web_search(query: str) -> str:
     return web_tools.brave_search(query)
 
 
+@tool
+def send_file(file_content: str, filename: str, caption: str = '') -> str:
+    """Send a file to the user as a Telegram document attachment.
+    Use this when you need to send code, data, or any text content as a downloadable file.
+
+    Args:
+        file_content: The text content of the file to send.
+        filename: The filename with extension (e.g. 'report.txt', 'data.csv', 'script.py').
+        caption: Optional caption to display with the file.
+    """
+    return _send_file_impl(file_content, filename, caption)
+
+
 @tool
 def web_fetch(url: str) -> str:
     """Fetch and extract readable text content from a URL."""
@@ -360,7 +374,7 @@ async def main(payload: dict, context):
                   home_assistant, connect_google_account, list_google_accounts, remove_google_account,
                   manage_service, schedule_reminder, list_reminders, cancel_reminder,
                   list_calendars, get_calendar_events, list_gmail_messages, get_gmail_message,
-                  run_code]
+                  run_code, send_file]
 
     agent = Agent(
         model=model,