TextUI 0.2.0

TextUI 0.2.0 adds buffer runtime coordination while keeping Emacs widget.el as the control system.

Highlights:

• Routes top-level plist state changes to named refresh regions.
• Coalesces repeated regional updates and falls back to full reconciliation for structural changes.
• Adds dependency-aware lifecycle effects for timers, processes, and cleanup.
• Adds lifecycle-safe async callbacks that ignore stale work.
• Updates the btop prototype to use automatic state routing and managed live sampling.
• Documents the new state, effect, and regional refresh interfaces.

In the btop 50-process fixture, the routed details update improved from a median of 11.65 ms to 5.67 ms, about 2.05x faster, while continuing to use native widget.el push-button rows.

Verification:

• 87 ERT tests pass.
• Byte compilation passes with warnings treated as errors.
• Requires Emacs 29.1 or later.