test: add comprehensive tests for normalize and dynamic emissions modules

[avantikau]

Summary

• Adds 37 unit tests covering two previously untested critical pipeline functions: normalize_rewards_linear() in normalize.py and apply_dynamic_emissions_using_network_contributions() in dynamic_emissions.py
• These modules sit at the core of the reward distribution pipeline (scoring -> tier emissions -> normalization -> dynamic emissions) but had zero test coverage
• All 236 tests pass (199 existing + 37 new), no production code was modified

Test Coverage Added

Test Class	Count	Module Tested
TestNormalizeRewardsLinear	13	normalize.py
TestExponentialUnlockScalar	6	dynamic_emissions.py
TestGetNetworkTotals	6	dynamic_emissions.py
TestApplyDynamicEmissions	9	dynamic_emissions.py
TestNormalizeToDynamicEmissionsPipeline	3	Both (integration)

Key scenarios tested:

• Normalization invariants: sum-to-one, proportion preservation, division-by-zero protection
• Edge cases: empty inputs, all-zero scores, single miner, very small/large values
• Exponential unlock curve: boundary values (0 and 1), monotonic increase, mathematical correctness
• Network totals aggregation: duplicate repo deduplication, inactive miner filtering
• Dynamic emissions: recycling to RECYCLE_UID, emission conservation, low/high network contribution scenarios
• End-to-end pipeline: full normalize -> dynamic emissions flow verification

Test plan

• All 37 new tests pass locally (pytest tests/validator/test_normalize_and_dynamic_emissions.py -v)
• Full test suite passes (pytest tests/ -v — 236 tests, 0 failures)
• No production code modified

🤖 Generated with Claude Code