* fix(perf): reduce startup and inference overhead
* fix(perf): report effective whisper.cpp fallback settings
* fix(injection): add opt-in X11 paste for long dictations
* perf(vad): lower default silence timeout to 1.2s
* fix(types): resolve mypy errors across application source
* ci: run mypy in the lint job
* ci: include mypy in lint dependency group
* fix(types): narrow evdev timestamp comparison
* refactor(recognition): add SpeechEngine protocol and engine dispatch table
* refactor(settings): move About section and engine tables out of settings_dialog
* docs: add ARCHITECTURE.md and refresh docs index and AGENTS layout
* fix(settings): preserve GTK dialog compatibility after extraction
* style: format touched Python modules
* fix(types): keep local typecheck from syncing dependencies
* test(vad): align main startup expectation with new default
* style: sort engine registry and protocol test imports
* test(settings): follow extracted About builder attribute alias
* test(settings): isolate GTK dialog base in About test
* test(settings): isolate About color scheme build test
* test(settings): restore GTK base after About scheme test
* test(settings): isolate About scheme check from GTK mocks
* test(settings): support extracted dialog mixin methods
* docs: add before/after performance benchmark charts
* fix(injection): type instead of pasting when the clipboard holds non-text data
