feat: harden generic preset, add LLM retry, and finish tooling/docs

- PatternDef.validate + Luhn-gated credit-card detection; de-overlap the
  generic phone/date/IP patterns; presets.swiss unchanged (production behavior)
- strip g/y flags from nameHint so .test() is stateless (latent footgun)
- openAICompatibleProvider: bounded retry on transient failures (network /
  timeout / 429 / 5xx), configurable via retries + retryDelayMs
- eslint + prettier + vitest coverage (97%); CI runs lint/format/coverage
- docs: README badges + new-option docs, SECURITY.md, issue/PR templates

26 tests passing; build emits ESM+CJS+types.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CONTRIBUTING.md

@@ -9,9 +9,12 @@ new pattern presets, additional LLM providers, docs, and tests.
 git clone https://github.com/mobiletic/anonymizer.git
 cd anonymizer
 npm install
-npm test          # run the test suite (vitest)
-npm run typecheck # tsc --noEmit
-npm run build     # tsup → dist/ (ESM + CJS + types)
+npm test           # run the test suite (vitest)
+npm run test:coverage # tests + coverage report
+npm run typecheck  # tsc --noEmit
+npm run lint       # eslint
+npm run format     # prettier --write (or `npm run format:check` to verify)
+npm run build      # tsup → dist/ (ESM + CJS + types)
 ```
 
 ## Guidelines