v0.3.0 — Discord provider + failover orchestration

v0.2.0: Reject feedback + timeout UX

- Reject feedback prompt: after reject, bot asks for reason (configurable timeout)
- Timeout cleanup: removes stale buttons + sends timeout notice
- New config: reject_feedback_timeout (default 60s, set 0 to skip)
- Accepts direct messages as feedback (no reply-to required)

v0.1.0: Initial release

- Telegram provider with inline keyboard (Approve/Reject)
- Trusted user whitelist
- Audit logging (JSONL)
- i18n support (en/zh-CN/zh-TW)
- Configurable timeout
- JSON stdout for agent consumption
- Exit codes: 0=approved, 1=rejected, 2=timeout