merge fix/event-flow-ux: v1.1.1 event flow, streaming, UX fixes

add Python 3.14 to CI, rewrite README

v1.0.1: fix interrupt key binding

v1.0.0: Textual TUI, event-driven architecture

v0.2.4: fix staircase display

v0.2.3: clean display, stop exploration tool spam

v0.2.2: fix interrupt history corruption, reduce tool spam

v0.2.1: fix Ctrl+C exit and watcher race condition

v0.2.0: thinking mode, retry, project instructions

Fix build backend and CI install