Refactor bilateral offline tests for shared mode

[cryptskii]

Adapt bilateral offline integration tests to shared single-process test mode by removing assumptions about sender-local persistence and BCR projections and focusing on receiver-side settlement and shared history visibility.

Changes:

• Remove sender balance and BCR state assertions that were not a faithful proxy for independent device DBs.
• Keep and assert receiver-side balance projections and transaction-history visibility.
• Add helper functions: assert_receiver_projection, history_contains_transfer, assert_shared_history_visibility, and parameterized single-direction transfer helpers for ERA/dBTC.
• Replace previous round-trip tests with fresh-setup single-direction tests (ERA and dBTC) and a repeated fresh-setup same-direction test.
• Fix execute_bilateral_transfer to process the commit response on the sender and clone the sender public key when configuring receipts.

This makes tests stable in shared single-process mode while preserving protocol coverage for receiver settlement and shared transaction visibility.

[Copilot]

Pull request overview

Refactors bilateral offline integration tests to run reliably in shared single-process test mode by removing sender-local persistence assumptions while keeping coverage for receiver-side settlement and shared transaction-history visibility.

Changes:

• Update bilateral transfer test assertions to focus on receiver balance projections and shared history visibility, removing sender balance/BCR assertions that don’t hold in shared DB mode.
• Add reusable helper assertions for receiver projections and history contents, plus parameterized single-direction transfer helpers for ERA and dBTC.
• Ensure the test transfer helper runs the full offline bilateral flow by having the sender process the receiver’s commit response, and fix receipt identity setup by cloning the sender public key where needed.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
dsm_client/deterministic_state_machine/dsm_sdk/tests/bilateral_round_trip.rs	Reworks tests into fresh-setup single-direction cases and adds helper assertions; fixes full-flow execution by processing commit response on sender.
dsm_client/deterministic_state_machine/dsm_sdk/tests/bilateral_full_offline_flow.rs	Adjusts test intent/docs and removes sender-local projection/BCR assertions, retaining receiver settlement + history verification.

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