Yoke v0.3.0

Added

• Stop actions — a ⏹ Stop button (or POST /api/agent/stop) cancels the
  running agent run; the run ends with a "Run stopped" notice instead of an
  error.
• Shell command timeouts — !timeout=<seconds> and timeout_seconds on
  POST /api/shell and the agent's run_command tool set a per-command limit
  (1-3600s, default 15s).
• Background shell jobs — !!<command> runs asynchronously: the request
  returns a job id immediately, the command waits for approval then runs in
  the background. New endpoints GET /api/shell/jobs,
  GET /api/shell/<id>, POST /api/shell/<id>/stop, a Shell jobs panel, and
  /shell, /shell stop, /shells commands.
• History restore — the conversation is restored into the view on login,
  page reload, and project switch (active + archived messages, tool calls and
  results included).
• Higher default iterations — default max agent iterations raised from 10
  to 100 (max 30,000).
• Configurable approval timeout — APPROVAL_TIMEOUT_MINUTES env var
  (default 5).

Fixed

• Approval prompts during agent runs — approval cards now render while the
  agent waits for permission on run_command/remote tools (polling previously
  only ran for ! shell commands, so prompts silently expired).
• Shell timeout/stop actually kills the command — Deno's AbortSignal
  does not kill subprocesses; output now goes to temp files and the process is
  terminated explicitly.