feat(account): add csv and json output for transactions

[geavenx]

Summary by CodeRabbit

Release Notes

• New Features

  • Added machine-readable export formats for account transactions: CSV and JSON options via new --output flag, enabling scripting and spreadsheet workflows.

• Documentation

  • Updated documentation to describe transaction listing with export format options and usage examples.

• Tests

  • Expanded test coverage for transaction output formats and command behaviors.

[coderabbitai]

📝 Walkthrough

Walkthrough

The PR extends the CLI transaction command to support multiple output formats (table, csv, json) via a new --output option, adds corresponding formatting functions to render transactions in CSV and JSON, and includes comprehensive test coverage for the new functionality.

Changes

Cohort / File(s)	Summary
Documentation AGENTS.md, README.md	Updated transaction listing documentation to reflect new --output (-o) option and supported output formats (table, csv, json). Increased test count guidance from 109 to 119 tests.
CLI Output Formats src/arcter/cli.py	Added TransactionOutputFormat enum with table/csv/json members. Introduced _print_transaction_csv() and _print_transaction_json() functions. Extended account_transactions() command with output_format option to enable runtime format selection. Added imports for csv, json, and sys modules.
Test Coverage tests/test_account_cli.py	Added 10 new tests covering CSV and JSON output formatting, field validation, filter respect, null handling, empty states, and edge cases. Tests verify default table behavior remains unchanged and validate proper output format rendering.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 Hop along, dear transactions, new formats to explore!
CSV hops, JSON prances, tables shine like never before,
A rabbit's dream of export—where data dances free,
In spreadsheets and scripts, oh what joy for thee! 📊✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 3.57% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and accurately describes the main change: adding CSV and JSON output format support for the transactions command.

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✨ Finishing touches

• 📝 Docstrings were successfully generated.

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/transactions-output-formats

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[coderabbitai]

Note

Docstrings generation - SUCCESS
Generated docstrings for this pull request at #3