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/scenes/director.test.mjs

@@ -12,7 +12,6 @@ import { readShellSource } from '../testSupport/readShellSource.mjs';
 // cancellable — an AbortSignal for the data manager, a liveness predicate for
 // the visual commit. Several of these assert exactly that plumbing.
 import assert from 'node:assert/strict';
-import fs from 'node:fs';
 import test from 'node:test';
 
 import { SceneDirector } from './director.js';