fix: /new command now cancels running processes (#222)

[Nathan Schram (nathanschram)]

Summary

• /new now cancels all running tasks for the chat before clearing sessions
• Previously only cleared resume tokens, leaving old processes running (~400 MB each)
• This leaked processes and worsened memory pressure, contributing to earlyoom kills (rc=143)
• Reply message shows "cancelled run and cleared" when a process was killed

Closes #222

Changes

• src/untether/telegram/commands/topics.py — _cancel_chat_tasks() helper; updated both /new handlers
• src/untether/telegram/loop.py — running_tasks in TelegramCommandContext; passed through all call sites
• tests/test_telegram_topics_command.py — 10 new tests
• 7 docs updated to reflect new /new behaviour
• Bumped to 0.35.0rc12

Test plan

• Unit tests: 1803 passed, 81.37% coverage
• Integration tested via @untether_dev_bot:
  • Claude: /new while running → cancelled + cleared
  • Codex: /new while running → cancelled + cleared
  • OpenCode: /new while running → cancelled + cleared
  • No running task: shows "cleared stored sessions"
• Logs show new.cancelled_running event with chat_id and count
• No errors or warnings in dev bot logs

🤖 Generated with Claude Code

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