fix(uint256): align Lsh truncation safety

[junghoon-vans]

Summary

• align uint256.Lsh with truncation semantics and update the affected sqrt-price and swap fuzz expectations
• add a overflow/range guard to getNextPriceAmount1Add so the final sqrt-price add path cannot wrap or exceed the uint160 cast boundary
• harden launchpad tier ratio validation by rejecting negative ratios before the sum-to-100 check

Testing

• make test PKG=gno.land/p/gnoswap/gnsmath RUN=TestSqrtPriceMath_getNextPriceAmount1Add
• make test PKG=gno.land/p/gnoswap/gnsmath

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a2cbfa40-51c6-4098-9d1c-c7b1da55433f

📥 Commits

Reviewing files that changed from the base of the PR and between b9754cd and 2403c3b.

📒 Files selected for processing (9)

• contract/p/gnoswap/gnsmath/errors.gno
• contract/p/gnoswap/gnsmath/sqrt_price_math.gno
• contract/p/gnoswap/gnsmath/sqrt_price_math_fuzz_params_test.gno
• contract/p/gnoswap/gnsmath/sqrt_price_math_test.gno
• contract/p/gnoswap/gnsmath/swap_math_fuzz_params_test.gno
• contract/p/gnoswap/uint256/bitwise.gno
• contract/p/gnoswap/uint256/bitwise_test.gno
• contract/r/gnoswap/launchpad/v1/launchpad_project.gno
• contract/r/gnoswap/launchpad/v1/launchpad_project_test.gno

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch GSW-2609-uint256-lsh-semantics

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
6.2% Duplication on New Code

See analysis details on SonarQube Cloud