Persist pyscript states through supported Home Assistant APIs #885

state.persist relies on Home Assistant internals in two places:

• register_persist() in state.py hands a stand-in PyscriptEntity to RestoreStateData.async_restore_entity_added, so Home Assistant saves the state at shutdown.
• restore_state() in __init__.py reads the stored states back out of RestoreStateData at startup. Its own comment says it "should re-implement using RestoreEntity".

Home Assistant 2026.11 changed that internal data (home-assistant/core#183906), which stopped pyscript from setting up (#882, worked around in #883). Any later change to it can break persistence again.

Two ways to move onto supported APIs:

• Make each persisted variable a real RestoreEntity, so Home Assistant saves and restores it through the entity API.
• Keep persisted variables in pyscript's own Store (homeassistant.helpers.storage), saved on change and at shutdown, loaded at setup.

Either way, restore timing should stay as it is today: every persisted pyscript.* state is back at startup, before any script calls state.persist.