v1.3.53 - Test browser workflow recovery

I added a dependency-free browser lab and portable procedure for combined navigation, saving and simulated session recovery.

• Actual Back/Forward preserves exact entry identity and reconciles URL/view movement around dirty editors.
• A native departure supersedes older save approval before source restoration, so late acknowledgements cannot navigate from an already-moved entry.
• Controlled outcomes cover changed/cancelled departures, newer edits, simulated expiry/account switching and stale reads/writes/finalizers. Authentication and service are visibly simulated.

Validation includes 26 focused tests, 911/911 local source and exact-package tests, eight disposable upgrade combinations and 65 actual-browser checkpoints. Independent re-review accepted the exact head/tree/archive and closed both findings. Installer/updater, integration and installed skill payload remain unchanged.

The original macOS/Node20 crypto-harness timeout and one successful unchanged failed-job retry remain recorded; the timeout cause is unresolved. Linux retains three existing hosted-suite skips. These finite observations establish no real service/auth enforcement, durable storage, browser unload/reload guarantee, original parity or model-quality proof.