…path fix

The friendship-path `account' = 0'` item is no longer just "blocked cross-repo" — the
upstream key-wallet fix is submitted as rust-dashcore#813 (honor the AccountType
`index` instead of a hardcoded 0', red→green test, backward-compatible for account 0).
Also correct the framing: it's not a counterparty-interop break (the recipient pays
from the shared xpub and ignores accountReference per DIP-15) — it's a single-account
limitation, the same gap as the deferred multi-account item, gated on #813.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…path fix

The friendship-path `account' = 0'` item is no longer just "blocked cross-repo" — the
upstream key-wallet fix is submitted as rust-dashcore#813 (honor the AccountType
`index` instead of a hardcoded 0', red→green test, backward-compatible for account 0).
Also correct the framing: it's not a counterparty-interop break (the recipient pays
from the shared xpub and ignores accountReference per DIP-15) — it's a single-account
limitation, the same gap as the deferred multi-account item, gated on #813.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…ork() removal

Updates all 8 rust-dashcore workspace deps 981e97f1 -> ceee4a9b40 (dev HEAD), which
picks up #813 (DashPay account-index derivation path) and #814 (revert of the temporary
#808 Core 23 nested-masternode-address SML changes), so platform keeps the existing
flat-field masternode shape and no consensus change is needed.

The bump also crosses #802 (removed Address::network(), replaced Network with AddressPrefix
because an address's prefix is ambiguous across testnet/devnet and legacy-regtest). Migrate
the four call sites:
- wasm-sdk validate_address: addr.is_valid_for_network(net) — a bool, exactly what it
  computed and now correct for the shared testnet/devnet prefix.
- platform-wallet derivation_path_for_derived_address: the path only distinguishes mainnet
  (coin 5') from everything else (1'), so probe is_valid_for_network(Mainnet).
- platform-wallet-ffi address rendering (2 sites): an address_display_network helper probes
  mainnet/testnet/regtest, decisive for the bech32m platform-payment addresses rendered here
  (mainnet ds / testnet+devnet tb / regtest dsrt).

Migration tracked in #3939. Full workspace --all-targets compiles.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>