chore: remove unused imports and local helpers

Drop module-local helpers that nothing calls (linkAbort, summarize,
stringOption, summarizeEntity and the polygonCenter, propertyObject and
unwrapProperties helpers only it used, CALLOUT_DOT_SIZE_PX) and unused
import specifiers in runtime modules, tests, QA scripts and tools.

None of the removed bindings is exported. Re-exports such as the ALPR
policy constants and every package export are unchanged.

src/keyboardFocusStyles.test.mjs

@@ -1,7 +1,6 @@
 import { readStylesheet } from './testSupport/readStylesheet.mjs';
 import test from 'node:test';
 import assert from 'node:assert/strict';
-import { readFileSync } from 'node:fs';
 
 const css = readStylesheet(new URL('../style.css', import.meta.url));