Moudy e5b77a27d5 refactor: localize private_pda_npk_by_position and extract authorization helper ...

Addresses the following review comments from @Arjentix:

- "I think we can move this into `derive_from_outputs()`"
  (on the position → npk map construction in main())
  I moved the construction inside ExecutionState::derive_from_outputs
  and stored the map as a field of ExecutionState. derive_from_outputs
  now takes `private_account_keys` directly and builds the map as part
  of state initialization. main() no longer owns the intermediate
  structure. validate_and_sync_states reads the npk through
  self.private_pda_npk_by_position.

- "Let's move this whole `is_authorized` computation into a separate
  function. This became really bulky"
  I extracted the caller-seeds resolution, family-binding recording,
  and is_authorized computation into a free function
  `resolve_authorization_and_record_bindings`. It takes the three
  field borrows it needs (`&mut pda_family_binding`, `&mut
  private_pda_bound_positions`, `&private_pda_npk_by_position`), same
  shape as `assert_family_binding`. A method would have conflicted
  with the `&mut self.post_states` borrow held by the Occupied match
  arm; the free function lets rustc split-borrow the self fields.

2026-04-22 15:55:35 +02:00

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