feat(rs-platform-wallet/e2e): identity-credit sweep + ID-001/002/003/005 tests

[lklimek]

Issue being fixed or feature implemented

The platform-wallet e2e harness had no real identity-credit sweep — sweep_identities was a no-op stub that would silently leak identity credits across CI runs until the bank starved. Identity-feature tests (ID-NNN) were also entirely unimplemented; the spec defined them but no test code existed.

This PR delivers both: a real sweep_identities implementation with a persistent bank identity, plus four ID-NNN test cases (ID-001/002/003/005) covering the identity-credit money-flow loop end-to-end.

Stacks on top of #3563 (e2e harness extensions). Targets feat/rs-platform-wallet-e2e-cases so it merges in the same trunk-down sequence.

What was done?

Bank identity persistence (framework/bank_identity.rs — new):

• Hybrid load strategy: PLATFORM_WALLET_E2E_BANK_IDENTITY_* env-vars primary, workdir-persisted JSON fallback.
• Auto-bootstraps from the bank wallet's primary address at DIP-9 index 0xBA77 (high index = no collision with test indices 0..n).
• Cross-checks wallet_id on load to surface bank-mnemonic mismatches loudly.

Identity-credit sweep (framework/cleanup.rs::sweep_identities_with_seed):

• Iterates registered identities at DIP-9 indices 0..IDENTITY_DISCOVERY_GAP (=8).
• Builds a deterministic SweepPlan (covered by build_sweep_plan_* unit tests).
• Broadcasts CreditTransfer to the bank identity via the harness signer.
• Replaces the previous no-op; Harness-ID-1 regression pin asserts the contract.

ID-NNN test cases (tests/e2e/cases/):

• id_001_register_identity_from_addresses.rs — IdentityWallet::register_from_addresses happy path.
• id_002_top_up_identity.rs — top_up_from_addresses happy path.
• id_003_identity_to_identity_transfer.rs — transfer_credits_with_external_signer between two harness-owned identities.
• id_005_identity_to_addresses_transfer.rs — transfer_credits_to_addresses_with_external_signer round-trip back into wallet.
• id_sweep_recovers_identity_credits.rs — sweep self-test (registers identity, teardown, asserts bank receives the credits).

STUB pinning for deferred cases (TEST_SPEC.md):

• ID-004 (identity update — needs signer cache-injection helper for freshly-issued keys).
• ID-006 (load by index — needs TestWallet::from_seed_bytes rebuild helper).
• ID-001c, ID-005b, ID-006b (P2 deferred behind P0/P1).

How Has This Been Tested?

cargo fmt --check                      # green
cargo check --tests                    # green
cargo clippy --tests -- -D warnings    # green
cargo test --lib                       # 131 passed
cargo test --test e2e -- build_sweep_plan default_spec
                                       # 5 passed (harness unit cohort)

E2E identity tests are gated behind PLATFORM_WALLET_E2E_BANK_MNEMONIC and PLATFORM_WALLET_E2E_BANK_IDENTITY_* env-vars (not run in CI by default; operator runs against testnet).

Breaking Changes

None. Additive: new framework module, new test cases, no API changes to the wallet crate itself.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

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

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[lklimek]

merged into feature branch test/platform-wallet-e2e