feat(chain)!: derive balance trust from output ancestry

feat(chain)!: derive balance trust from output ancestry

balance becomes a fold over classify_outpoints. A pending output's trust is now
taken from its unsettled ancestry (untrusted if an unsettled ancestor taints or
is missing from the view), not from a per-output flag.

BREAKING CHANGE: balance takes does_taint and is_settled instead of trust_predicate
and min_confirmations, and plain OutPoints instead of (identifier, outpoint)
pairs.

Co-authored-by: Dmenec <dmenec@proton.me>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>