add-resend

通过 Resend 将 NanoClaw 连接到电子邮件，实现异步邮件会话处理。

把邮件接入到系统里，用 Resend 把电子邮件作为异步会话通道连到 NanoClaw，让代理可以像聊天一样处理邮件往来。适合需要把客服或自动化回复接到邮箱、用邮件做长期会话的场景。实现上是通过 Chat SDK 把 Resend 适配器拉进来，方便在不改内核的情况下快速接入邮件通道。

# Add Resend Email Channel

Connect NanoClaw to email via Resend for async email conversations. NanoClaw
doesn't ship channels in trunk — this skill copies the Resend adapter in from the
`channels` branch.

The mechanical steps under **Apply** carry `nc:` directive fences: an agent reads
the prose and applies them, and a parser can apply them deterministically from
the same document. Every directive is idempotent, so the whole skill is safe to
re-run; anything a parser can't apply falls back to the prose beside it.

## Apply

### 1. Copy the adapter

Fetch the `channels` branch and copy the Resend adapter into `src/channels/`
(overwrite — the branch is canonical):

```nc:copy from-branch:cha