Support Qoder CLI sessions

## Support Qoder CLI sessions

### Problem

[Qoder CLI](https://qoder.com) (Alibaba's agentic coding CLI) is not among the supported adapters. Users who work across Claude Code, Codex, and OpenCode also frequently use Qoder, and their sessions are invisible to `fr`.

### Storage format (verified on Qoder CLI 1.1.47, macOS)

Qoder stores sessions in `~/.qoder/projects/`, using a directory layout and JSONL event format that is **nearly isomorphic to Claude Code**:

- `~/.qoder/projects//.jsonl`
- `` = absolute path with `/` replaced by `-` (same encoding as `~/.claude/projects`)
- Event types observed: `workspace-directories`, `user`, `assistant`, `attachment`, `last-prompt`, `active-leaf`
- Each line carries `sessionId`, `uuid`, ISO timestamps; user/assistant messages are nested under `message.role` / `message.content` just like Claude Code transcripts
- There are no `summary` lines (unlike Claude Code), so a session title can be derived from the first user prompt or the `last-prompt` event

Example first lines of a session file:

```jsonl
{"type":"workspace-directories","sessionId":"3915f6e3-...","directories":["/Users/x/repo"]}
{"type":"user","uuid":"9394f80b-...","timestamp":"2026-09-02T16:10:15.014Z","message":{"role":"user","content":[{"type":"text","text":"..."}]}}
```

### Resume behavior

Qoder CLI supports the same resume flags as Claude Code:

- `qoder --resume ` — resume a specific session
- `qoder --continue` — continue most recent session
- `qoder --list-sessions` — list sessions for the current project

Resume should be run from the project directory (encoded in the folder name).

### Suggested behavior

Add a `qoder` adapter that scans `~/.qoder/projects/*/*.jsonl` and generates resume commands of the form `qoder --resume ` (with cwd = decoded directory name). Given the format is essentially Claude Code-compatible, the adapter may be a thin re-use of the Claude adapter logic with a different data dir and no summary-line handling.

Happy to help test.