Tab Memory Manager Support

Tab Memory Manager support

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Chrome exposes system-wide memory availability but not trustworthy per-tab memory usage.

Custom canvas editors and application-managed form state may be unavailable to the form-safety helper; unknown state is protected.

Active, audible, pinned, restricted, already discarded, and unsafe tabs are deliberately excluded from hibernation.

Restoring a discarded tab reloads its page and the site may not recreate application state that it did not persist.