[ASIDISG]

Summary

Adds src/test_replace_issuer_transfer.rs, an adversarial suite for replace_issuer_transfer.

Axis	Cases
Success	replace swaps the target, restamps the timestamp and preserves the window; the zero default marker is preserved; replace with the same target restamps; one atomic iss_canc + iss_prop event pair
Typed rejections	unknown offering OfferingNotFound; no pending transfer, wrong namespace and replace after accept are NoTransferPending; the new issuer after accept is NotAuthorized; ContractFrozen and ContractPaused (the pending proposal survives, and replace works after unpause)
Boundary	after a replace the default window accepts exactly one default window after the replace time; a custom window uses the preserved seconds from the replace time
Isolation	replacing one offering's proposal leaves a sibling offering's untouched

Closes #1058

Independence and verification

• This branch is only src/test_replace_issuer_transfer.rs plus its two-line mod declaration in src/lib.rs, on top of the shared style: cargo fmt --all commit (test: make the lib test target build and run to completion #1272 carries the identical commit, so the four test PRs and test: make the lib test target build and run to completion #1272 merge in any order without conflicts; I checked all orders by merging them together).
• cargo fmt --all -- --check is clean on this branch.
• master's lib test target does not currently compile; test: make the lib test target build and run to completion #1272 fixes that. Verification was run on this branch merged with test: make the lib test target build and run to completion #1272:

cargo test --lib test_replace_issuer_transfer::
test result: ok. 14 passed; 0 failed

and with all four test branches merged together: 53 passed, 0 failed.

Not claimed

The earlier version of this PR stacked on the other three and quoted "307 passed" from a different base. Those numbers are gone; the figures above are what this branch produces.

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