fix(transactions): preserve decoded calldata Map in simplified receipts

[bars26]

Closes #219

Summary

simplifyTransactionReceipt's internal simplifyObject helper walks nested values with Object.entries(), but decoded calldata (txDataDecoded.callData / constructorArgs, per abi/calldata/decoder.ts's TYPE_MAP) is a Map<string, CalldataEncodable>, not a plain object. Object.entries() on a Map returns no entries, so the decoded method name and arguments were silently dropped from the default (simplified) receipt instead of only removing the raw presentation metadata this function is meant to strip.

Fix

Detect a Map before falling into the generic object branch, and convert it to a plain object so its entries go through the same simplification as everything else (recursively, same as arrays/objects).

Branch

Targeting v2-dev, not v1: the simplifyTransactionReceipt / calldata-Map code this bug lives in doesn't exist on v1 at all (checked — no simplif* files there), so there's nothing to fix on the stable branch.

Note on assignment

CONTRIBUTING.md asks contributors to self-assign the issue before starting — I don't have write access to do that as an outside contributor (gh issue edit --add-assignee @me fails with a permissions error), so I'm opening this directly. Happy to close and resubmit if you'd rather it go through a different flow.

Test plan

• Added two regression tests reproducing the exact repro from the issue (a Map-shaped callData and a Map-shaped constructorArgs), both verified to fail with the old code (undefined instead of the decoded values) and pass with the fix
• vitest run --typecheck: 195/195 tests pass, no type errors
• eslint: clean on changed files

🤖 Generated with Claude Code

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