Add mouse-driven text selection in the response pane. Enabling SGR mouse tracking (1002+1006) lets a drag select text, which is copied to the clipboard on release; the wheel scrolls the pane. Interception happens in the existing useInput handler since Ink surfaces the whole SGR report as a single event. Also stop advertising paikea's own plumbing to the model: the obsidian-cli skill (marked internal) and the openspec workflow skills are no longer listed in the system prompt, so a user's project work isn't warned about "conflicts" with them. The OpenSpec step guidance still drives the workflow under the hood. Fixes folded-YAML (`description: >`) skill descriptions. Release 0.0.1.