test: cover ContractCallLocal fee calculation for out-of-range gas values

[ruslanvelkov-beep]

Description

Adds unit-test coverage for ContractCallLocalFeeCalculator fee calculation at the
boundary gas values, pinning down that the query-fee arithmetic is sign- and
overflow-safe for a client-supplied gas.

accumulateNodePayment forwards the query's gas into the shared extra-fee accumulation
(FeeResult.addServiceExtraFeeTinycents), which clamps the billable count with
Math.max(0, used - included) and accumulates it with the saturating clampedMultiply /
clampedAdd helpers. The existing tests only exercised gas = 0 and a small positive
value, leaving the sign/overflow edges uncovered.

Tests added (no production code changed)

ContractServiceFeeCalculatorsTest:

• testContractCallLocalWithNegativeGasChargesBaseFeeOnly — a negative gas clamps the
  extra count to zero, so only the base fee is charged (no negative extra fee).
• testContractCallLocalWithMaxGasSaturatesInsteadOfWrapping — a Long.MAX_VALUE gas
  saturates via clampedMultiply/clampedAdd (fee overcharges) rather than wrapping into a
  negative or undercharged value.

Both assert exact totals against the test fee schedule, so a future change that reintroduced
raw (wrapping) arithmetic or dropped the negative-clamp would fail these tests.

Related issue(s)

N/A

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff            @@
##               main   #26947   +/-   ##
=========================================
  Coverage     70.50%   70.50%           
  Complexity    11690    11690           
=========================================
  Files          2586     2586           
  Lines        108469   108469           
  Branches      12142    12141    -1     
=========================================
+ Hits          76474    76475    +1     
+ Misses        28015    28013    -2     
- Partials       3980     3981    +1     

see 1 file with indirect coverage changes

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[testlens-app]

✅ All tests passed ✅

🏷️ Commit: 6815c65
▶️ Tests: 1909 executed
⚪️ Checks: 39/39 completed

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