v4.20.2

Focus: Stale-deploy resilience and hydration-safe persisted state.

Changes

• 🔄 Added first-paint recovery from stale deploys: when cached HTML references redeployed chunk hashes, the module entry dies on strict MIME checking before any app code runs — an inline head script now detects the failure and reloads once (session-guarded, re-armed when the app boots)
• 🗄️ Documents now ship Cache-Control: public, max-age=0, must-revalidate and hashed assets immutable — a refresh after a redeploy always gets fresh HTML
• 🤖 Fixed a hydration mismatch (and an empty open drawer) for visitors with a persisted assistant panel: the store boots with server-parity values and the persisted state applies right after mount
• ✅ Validated by simulating both scenarios: a 404-ing module entry auto-recovers in one reload, and a persisted-assistant profile hydrates with zero mismatches (335 passing tests)