Fix/ai Providers Docs

[jasperf]

This release bumps Waygate to version 0.6.2 and corrects documentation around AI provider API key configuration. The primary documentation change clarifies that all supported AI providers — Mistral, Claude, OpenAI, and Gemini — accept API keys through both environment variables and the WordPress admin UI (Settings → Connectors), resolving potential confusion for site administrators who configure keys interactively rather than via .env files. The version string has been updated in waygate.php and a corresponding entry added to CHANGELOG.md in accordance with the project's version bump checklist.

Version and Release Management:

• Bumped WAYGATE_VERSION constant and plugin header in waygate.php to 0.6.2, reflecting this patch-level documentation fix.
• Added a ## [0.6.2] changelog entry to CHANGELOG.md documenting the clarification.

Documentation:

• Updated README.md to explicitly state that API keys for all providers can be configured via either environment variables or the WordPress admin UI, removing the implicit assumption that env vars are the only mechanism.
• The clarification aligns documentation with actual plugin behavior, reducing support friction for administrators on managed hosting environments where .env access is restricted.

Files Changed:

• CHANGELOG.md (Modified)
• README.md (Modified)
• waygate.php (Modified)