v0.1.0

Initial release of the DSH side-chat plugin.

• /side opens an independent read-only side chat that inherits the main session's context, persona, and model
• Context copied as agent memory but not displayed in the panel
• Read-only tool whitelist (no bash/write/edit)
• Markdown rendering (tables, code blocks, headings, lists)
• Adaptive panel: real layout sidebar (wide) / overlay drawer (narrow)
• Close fully disposes the agent