TrustBeacon 0.1.13 - wording correction validation

Scope: provider-neutral generic DKIM discovery wording in report, selector help, ability description and documentation. Actual DNS selector names remain available as technical lookup evidence.

Local validation:
- All PHP files passed syntax checks on PHP 8.3.6.
- Existing deterministic tests passed: DKIM 39, service/abilities 30, runner 4, presentation 22, rendering 38 (133 total).
- Rendered the actual discovery checker output through the production findings view, alongside the production selector help. Both use generic wording; INFO remains Not scored.
- Inspected the source diff against 0.1.12: runtime changes are text and version metadata only. Selector list, validation, scoring and permission checks are unchanged.
- Case-insensitive provider-name search: remaining references are the real selector names and their development fixture.
- Production ZIP excludes tests; development archive retains them.

Prior release evidence:
- 0.1.12 was tested on itechguide.com through WPVibe; the user supplied a clean Plugin Check result.
- Live WordPress REST dispatch under the author account returned HTTP 403 for both abilities. The run-audit check confirmed the saved report was unchanged.
- 0.1.12 was published at SVN revision 3752443.

Limits:
- 0.1.13 has not yet been installed or tested live, and Plugin Check has not been rerun on 0.1.13.
- Render review used local WordPress stubs, not a live dashboard/browser screenshot.
- The plugin requires a fresh audit for a new plugin version. Previously saved observations are not silently rewritten.
