v0.9.0

Added Wisp Context Server: trusted MCP clients can read selected text, clipboard, active window, browser-page text, and screen snippets.
Added ready-to-paste MCP client configuration and server setup documentation.
Fixed:
Prevented selection capture from accidentally copying text out of the assistant’s own window.
Serialized clipboard-based captures across Wisp and MCP processes to avoid clipboard restore races.
Added clear per-tool errors and startup diagnostics for missing capture dependencies.