cesr-rs-v0.5.0

Added

• (#87) [breaking] K1 KeyState fold + domain model (Authority/Commitment/Establishment) (#136)
• (#87) [breaking] K1 — KeyState + pure key-state fold (sans-io KERI core) (#134)

Other

• (#96) [breaking] K0 — convert to workspace + keri-rs sibling crate (#126)

Added

• Standard derives (Debug, PartialEq, Eq; Clone on Seqner/Number) on
  Matter, Number, Seqner, and Debug on Identifier — needed by keri-rs's
  KeyState (#87).

Changed (breaking)

• Removed the logic-free cesr::keri::KeyState (and its cesr::KeyState re-export).
  Computed key state now lives in the keri-rs crate as a folded KeyState<'a> (#87).
• Tholder::satisfy is now index-based: satisfy(indices: impl IntoIterator<Item = u32>)
  instead of the count-based satisfy(count: u64), and is no longer const. Weighted
  thresholds are positional (each clause owns a run of key positions), so satisfaction
  requires the signer index-set, not a bare count — the previous signature could only
  ever return false for Weighted. This is the single canonical satisfaction routine
  (the complete implementation previously lived in keri-rs::threshold::satisfied_by,
  now removed) (#87).