Adds an Agents feature: start coding agents (Claude Code, Codex, Gemini CLI,
Copilot, Cursor, OpenCode and more, plus custom ones from
<config>/agents/<id>.toml) on a task, each in its own git worktree or in the
checkout, and follow them from the IDE.
- ide-agent crate: one ACP agent process per task (newline-delimited
JSON-RPC), the timeline folded from session/update, permission requests,
session settings (model, mode, thinking effort), slash commands, context
usage, a message queue with "send now", @-referenced files (embedded when
the agent takes embedded context) and images. Tasks persist and their
sessions are reloaded with session/load.
- Agents tool window grouped by what each task needs; a task opens as an
editor tab with the conversation, a permission banner and its changes
(diff against the task's base). New Task is an editor page.
- Composer: @ file references from the project index, / commands,
up/down history, pasted or dropped images, Shift+Tab cycles the mode.
"Send to Agent" adds the editor selection or Project view files.
- Editor: the Switcher lists every open editor, not only files; editor
kinds can mark their tabs restorable, so agent tabs survive a reload.
- Select popups size to fit short option details.
