William Research Admin Agent v0.4.0

Security and privacy hardening release for the Free edition.\n\nHighlights:\n- Expiring, single-use confirmations for protected actions and audited read-only MCP tools.\n- Encrypted conversation data, recursive sensitive-data redaction, retention controls, and privacy export/erase support.\n- Hardened outbound requests, redirects, media handling, browser rendering, and admin navigation.\n- Per-tool capabilities, multisite lifecycle support, dependency audits, immutable CI actions, and real WordPress Playground browser E2E coverage.\n\nInstall the attached ZIP or follow the repository installation guide.