test(coverage): add 9 test modules for contract test coverage push

[Josue19-08NC]

Description

Implements the full test coverage matrix described in #25. Adds 9 new test modules (6 for boundless-events, 3 for boundless-profile) covering every pillar, the paged cancel flow, escrow/fee math, the token whitelist, and all three profile operation surfaces. All tests use the native Soroban test harness with no mocks beyond mock_all_auths.

Changes

boundless-events:

• token_whitelist — register_supported_token, deregister_supported_token, create_event rejection of unsupported/deregistered tokens
• cancel_refund — paged cancel flow: OwnerOnly, FullPartnerThenResidual, ProRata, pagination across batches, all error variants
• escrow_fee_math — default fee, per-event override, add_funds rate snapshot, waiver (0 bps), MAX_FEE_BPS guard, single/60-40 payout math, admin fee update
• grant_pillar — Multi release required, fixed-split milestone math, last-milestone dust sweep, credit/rep side-effects, all error variants
• bounty_pillar — Single release required, apply/withdraw/submit gate, credit charge + 50% refund, select_winners pay+profile, all error variants
• hackathon_pillar — Single+deadline required, open submit model, multi-recipient distribution, cancel refund, all error variants

boundless-profile:

• credits — bootstrap, spend/earn/refund/admin_grant, all error variants + op replay + auth
• reputation — bump/slash/admin_slash, saturation, all error variants + op replay + auth
• earnings — register_earnings, zero/negative guard, multi-user/token tracking, i128::MAX saturation, op replay guard

Result: 203 tests passing (146 events + 57 profile), zero warnings, snapshots regenerated and committed.

Closes

Closes #25

Notes

• soroban_sdk::Vec shadows std::vec::Vec in test scope — array literals are used instead of .collect() to avoid the name collision.
• bump_saturates_at_max_u64 was renamed to bump_large_values_accumulate_without_overflow; since bump_reputation accepts u32, reaching u64::MAX would require 2^32 calls — the test instead verifies two u32::MAX bumps accumulate without integer overflow.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 678378a1-dfc6-42c1-a426-9b672316c0d1

📥 Commits

Reviewing files that changed from the base of the PR and between b80f064 and 9856ab4.

📒 Files selected for processing (11)

• contracts/events/src/tests/bounty_pillar.rs
• contracts/events/src/tests/cancel_refund.rs
• contracts/events/src/tests/escrow_fee_math.rs
• contracts/events/src/tests/grant_pillar.rs
• contracts/events/src/tests/hackathon_pillar.rs
• contracts/events/src/tests/mod.rs
• contracts/events/src/tests/token_whitelist.rs
• contracts/profile/src/tests/credits.rs
• contracts/profile/src/tests/earnings.rs
• contracts/profile/src/tests/mod.rs
• contracts/profile/src/tests/reputation.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Josue19-08NC]

Replaced by #54, opened from the correct account (Josue19-08). It was a mistake, as I had submitted it using my work account instead of my personal account.