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>

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,23 @@
+---
+name: Feature request
+about: Suggest a pattern preset, provider, or capability
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+## What problem does this solve?
+
+The use case or gap you're hitting (e.g. "no preset for German tax IDs", "want an Anthropic provider").
+
+## Proposed solution
+
+What you'd like to see. For a new preset, list the identifier(s) and an example value (synthetic, no real PII).
+
+## Alternatives considered
+
+Anything you've tried or other approaches.
+
+## Additional context
+
+Links, references, or examples.