docs: update README — add Qwen Code to comparison table, update features

chore: bump version to 1.15.1

fix(tui): revert scroll code to v1.15.0 baseline — restore working Shift+Up/Down

fix(tui): InputBar directly dispatches scroll keys to App actions

fix(tui): add priority=True to scroll bindings + explicit on_key scroll handlers

fix(tui): restore keyboard scrolling + revert mouse=True

fix(tui): enable mouse support (mouse=True), add config.mouse toggle

fix(tui): watch_scroll_y only pauses on upward scroll, never auto-resumes

fix(tui): replace mouse scroll handlers with watch_scroll_y watcher

feat: Docker sandbox, PTY runner, plan mode tools, Arena pattern

feat: real SSE streaming, profile hot-reload, marketplace search, TUI tests

fix(ci): remove unused dataclasses import in _cmd_set (ruff F401)

chore: bump version to 1.15.0, update README and CHANGELOG

fix(tui): enable mouse wheel scrolling in chat view

fix(streaming): hide raw XML tool calls from visible output