[Chore] Repository Cleanup: Remove Binaries, Test Artifacts, Orphaned Files, and IDE Config

[KarenZita01]

Description

The lib_original.rs (37KB) file exists alongside lib.rs (300KB) without any documentation about which is the current production version, what changes were made, or whether lib_original.rs can be safely deleted. Similarly, seed_tests.rs is referenced in test outputs but doesn't exist in the source tree. The .agents directory contains configuration for AI coding agents but isn't documented. The insurance_pool_demo.exe and .pdb files (1.5MB combined) are compiled Windows binaries committed to the repository, which is poor practice for a Rust/Soroban smart contract repo.

Cleanup issues:

• lib_original.rs - no clear purpose or migration path
• insurance_pool_demo.exe (208KB) - binary should be removed
• insurance_pool_demo.pdb (1.3MB) - debug symbols should not be in repo
• .codex - empty file, unclear purpose
• errors.txt (6.3KB) and test_out.txt (9.9KB) - test artifacts should be in .gitignore
• .idea/ - IDE configuration committed

Technical Context & Impact

• Affected Components/Files: lib_original.rs, insurance_pool_demo.exe, insurance_pool_demo.pdb, .codex, contracts/utility_contracts/errors.txt, contracts/utility_contracts/test_out.txt, .idea/, .agents/
• Impact: Repository Hygiene, CI/CD Performance, Security (binaries may contain secrets)

Step-by-Step Implementation Guide

1. Audit lib_original.rs: Compare with lib.rs; if superset of removed functions, delete; if contains unique logic, move to dedicated file with documentation
2. Remove binaries: git rm insurance_pool_demo.exe insurance_pool_demo.pdb
3. Update .gitignore: Add *.exe, *.pdb, *.txt in contract directories, .idea/, .codex
4. Move test artifacts: errors.txt (from compilation/test output) and test_out.txt (from test runs) should be moved to target/ or deleted
5. Document .agents: Add AGENTS.md explaining purpose of AI agent configurations
6. Clean up .codex: Remove empty file or add purpose documentation
7. Remove IDE files: git rm -r .idea/ and add to global .gitignore

Verification & Testing Steps

1. Run git clean -n to verify files are properly excluded
2. Build after cleanup: cargo build --package utility_contracts (should pass with no changes)
3. Run all tests: cargo test --package utility_contracts
4. Check repo size reduction: git count-objects -vH before and after
5. Verify no functional changes: cargo test should produce identical test results
6. Check CI pipeline runs cleanly after cleanup