kanbots

First release after v1.1.0. Big push on multi-agent / multi-repo / multi-session — 9 new agent CLIs, a workspace can now hold many repos, an issue can hold many chat threads, plus an in-iframe devtools panel for branch previews and one-command `npx kanbots` launch.

## ✨ New

- **Nine new agent CLIs.** Gemini, Amp, Cursor, Copilot, OpenCode, Droid, CCR, Qwen, and a generic ACP (Agent Client Protocol) JSON-RPC transport. Supported-agent count goes from 2 → 11 — pick the one you have a subscription for in the Task Create dialog.
- **Multi-repo workspaces.** A workspace can now hold more than one repo. Each card targets a chosen repo, the LeftRail shows a repo switcher with status badges, and the dispatch picks the right working tree at run time. New `workspace_repos` table + eight bridge channels for CRUD / status / open-in-IDE.
- **Multi-session chats per issue.** Open more than one chat thread against the same issue (or as a standalone conversation). `chat_sessions` is keyed on either a conversation id or a thread id, with a CHECK constraint that one and only one is set.
- **In-iframe devtools for branch previews.** The branch preview iframe now ships with Eruda (mobile-st