[Testing] collect_fee fee-rounds-to-zero branch untested - positive fee rate but amount too small to charge

[grantfox-oss]

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Why this matters

collect_fee guards with if fee > 0 at lib.rs:669. When fee_rate_bps > 0 but amount*bps/10_000 truncates to 0 (e.g. amount=1, 200 bps), no transfer and no FeeCollectedEvent occur and the full amount is credited. The only zero-fee test sets fee_rate_bps=0, a different branch.

Acceptance criteria

• initialize with a nonzero fee rate, create_stream with a tiny amount where fee rounds to 0
• Assert treasury balance is 0, deposited_amount == full amount, and no fee_collected event fired

Files to touch

• contracts/stream_contract/src/test.rs
• contracts/stream_contract/src/lib.rs

Out of scope

• fee_rate_bps == 0 case (already covered)

[Killerjunior]

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[grantfox-oss]

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