AutoStory M12 Full RNG integration #147

• Scope: every RNG-able Pokemon on the way can be RNG'd in place: starter (M7), gifts (Lapras, Eevee, fossils), statics (Snorlax, legendary birds, Mewtwo) and the roaming dog, through StarterRng, GiftRng, StaticRng, RoamingLegendaryRng and the RNG navigation. AutoStory walks there and saves, the RNG program runs, AutoStory continues. Routines locked in program classes move to callable functions in small upstream PRs first.
• PRs: about 5–8, after M7; the post-game targets after M11.
• Done when: a full run with RNG switched on ends with each targeted Pokemon matching its RNG target.

Tracked by the AutoStory master issue. Design: AutoStory-Architecture.md; PR tree and sizes: FRLG_SIZING.md.