test(platform-wallet): CR-004 spec — legacy BIP32 account UTXO update (dash-evo-tool#845)

[Claudius-Maginificent]

Summary

Adds CR-004 SPEC entry for the upstream bug dashpay/dash-evo-tool#845: SPV: Legacy BIP32 Account UTXOs not updated after transfer.

After sending all funds from a legacy BIP32 account using the advanced (explicit input selection) path, the wallet's local balance/UTXO state is not refreshed. A follow-up send_to_addresses then fails with Coin selection error: No UTXOs available for selection instead of a clean insufficient-funds error.

What this PR adds

• #### CR-004 entry in tests/e2e/TEST_SPEC.md under the Core / SPV (CR) section
• Quick-index row for CR-004 with priority/status

What this PR does NOT add

• The test body (cases/cr_004_legacy_bip32_utxo_update_after_spend.rs)
• The production fix in src/wallet/core/

Both implementation pieces will land in PR #3609 so the spec lands cleanly on feat/rs-platform-wallet-e2e independently of the QA fix wave.

Harness extensions called out in spec

• setup_with_legacy_bip32_funded_account(funding_duffs, utxo_count) — analogous to existing setup_with_core_funded_test_wallet but on the legacy DIP-9 path
• Reuse of wait_for_core_balance(target=0) from CR-003

Test plan

• grep -A 30 "^#### CR-004" renders the new entry cleanly
• No build needed — markdown only

_{🤖 Co-authored by Claudius the Magnificent AI Agent}

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Commit: 5451e410

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