Agent Bridge 1.0.5

Field-validation release. All eight MCP abilities are now validated end to end on a live production WordPress site through the official MCP Adapter, including the additive-only gate refusing an unconfirmed write over MCP. Fixes found live: registration hooks attach regardless of plugin load order, the nested meta.mcp.public flag is set for adapter builds that read only that key, a pre-0.4.0 hook-name fallback, and a registration diagnostics block in /health. See CHANGELOG.md.