v2.3.1 (beta)

Beta release.

Highlights since v2.3.0:

• Native macOS desktop notifications on turn completion and when awaiting input (no hooks required); ui.notifications / ui.notifyAfterSecs settings and a /notify toggle.
• Click-to-copy control (⧉ copy) on rendered code blocks.
• Text selection now survives scrolling (content-anchored) and copies in full even when larger than the viewport; a transient "Copied N chars" tip appears in the status bar for 10s.