feat: add rustdoc/NatSpec-style comments to TreasuryContract public API (#191)

[Jay989810]

Description

This PR adds comprehensive rustdoc/NatSpec-style comments to all public entrypoints, structs, enums, and error types in the TreasuryContract (COMEBACKHERE-contracts/contracts/treasury/src/lib.rs).

Documentation comments include # Arguments, # Returns, and # Errors sections for each function and maintain alignment with docs/contract-interaction-guide.md without duplicating essay-length prose.

Closes #191

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Changes Made

• Rustdoc Documentation:
  • Added /// doc comments for all 16 public entrypoints in TreasuryContract.
  • Added doc comments to public types: SettlementStatus, Settlement, TreasuryError, DataKey, and TreasuryContract.
• Test Coverage & Fixes:
  • Fixed dependency version lock in Cargo.lock (derive_arbitrary matched to v1.3.2).
  • Added unit tests for unpause, get_threshold, update_threshold, add_token_to_allowlist, remove_token_from_allowlist, deposit, withdraw, and authorization failure cases.
  • Ignored temporary test snapshot directory in .gitignore.

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Verification & Test Output

1. cargo doc Build

Command:

cargo doc --no-deps -p comebackhere-treasury
running 30 tests
test integration_dispute_lifecycle::test_raise_dispute_moves_settlement_to_onhold ... ok
test integration_dispute_lifecycle::test_dispute_on_pending_settlement_status_transition ... ok
test integration_dispute_lifecycle::test_resolve_dispute_callable_by_signer ... ok
test integration_settlement_multisig::test_multisig_propose_collect_2_of_3_execute ... ok
test integration_settlement_multisig::test_execute_settlement_verifies_token_transfer_setup ... ok
test tests::test_deposit_and_withdraw ... ok
test integration_settlement_multisig::test_weighted_signers_reach_threshold ... ok
test tests::test_empty_returns_empty ... ok
test integration_dispute_lifecycle::test_multiple_disputes_independent ... ok
test tests::test_get_and_update_threshold ... ok
test tests::test_exact_threshold_executes_settlement ... ok
test tests::test_mixed_statuses_filtered ... ok
test tests::test_limit_capped_at_100 ... ok
test tests::test_over_threshold_single_approval_executes ... ok
test tests::test_pagination_offset_and_limit ... ok
test tests::test_execute_when_paused_returns_contract_paused ... ok
test tests::test_set_signer_when_paused_returns_contract_paused ... ok
test tests::test_multi_signer_weight_accumulates_to_threshold ... ok
test tests::test_propose_when_paused_returns_contract_paused ... ok
test tests::test_single_pending ... ok
test integration_dispute_lifecycle::test_dispute_prevents_execution ... ok
test tests::test_approve_when_paused_returns_contract_paused ... ok
test integration_settlement_multisig::test_multiple_settlements_independent_approvals ... ok
test tests::test_zero_threshold_update_rejected ... ok
test tests::test_partial_approval_below_threshold_does_not_execute ... ok
test tests::test_unauthorized_admin_actions ... ok
test integration_settlement_multisig::test_single_signer_insufficient_for_threshold_2 ... ok
test tests::test_update_threshold_when_paused_returns_contract_paused ... ok
test tests::test_unpause_resumes_operations ... ok
test tests::test_token_allowlist_enforcement ... ok

test result: ok. 30 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.68s

[drips-wave]

@Jay989810 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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