Fix mutable tx handle and memo ID validation gap#939

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sagpatil wants to merge 3 commits intomasterfrom

fix/tx-immutability-and-memo-id-validation

Commits on Mar 17, 2026

Fix mutable tx handle and memo ID validation gap

sagpatil
and
claude
committed
Add negative test coverage for memo ID scientific notation and trailing decimal zero (#940)

Copilot
and
sagpatil
authored
Add unit test locking in `tx` getter defensive-copy immutability (#941)

Copilot
and
sagpatil
authored