Add Stablecoin privacy-preserving tests for WithdrawCollateral and RepayDebt
(personal and group-owned variants), plus a regression test confirming
OpenPosition is incompatible with the privacy circuit (chained-call
re-authorization). Close the last planned Token row (MintWithAuthority to a
private holding) and the ATA owner-signer gap for Transfer (personal and
group-owned), plus a defensive Create/group-owner test.
Extract shared privacy-test helpers (identity builders, GroupOwner
seal/unseal handshake) into integration_tests/src/lib.rs and use them
throughout token.rs, collapsing duplicated InputAccountIdentity/account
construction. Update docs/privacy-test-matrix.md with all new findings.
Validates the Q2 privacy features (shield/deshield, private-to-private transfers,
existing-account crediting, group-owned accounts, and private PDAs) against the
token and ata program flows, which previously ran almost entirely in public
context. Adds the key_protocol dependency for GMS-based group-account tests and
introduces a docs/privacy-test-matrix.md tracker mapping each program/instruction/
privacy-dimension combination to pass, fail, or not-expressible, with root-cause
findings for each gap (notably that private PDAs are structurally unsupported by
any program currently deriving addresses via for_public_pda).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Marvin Jones