PatchLevelManager.initialize previously called updateTo, which
overwrote security_patch.txt with explicit dates and destroyed
the Phase 1 default of system=prop. Split prop application into
a new private applyToProps so initialize only resetprops; never
writes the file. BulletinPoller now treats currentPatch() == null
(the signal for system=prop or missing/blank) as passive and
skips updateTo. The file becomes user-owned config; props track
PIF or the device default.
Enginex0
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