feat(cli): show repo allocation in miner score

[bittoby]

Summary

Add a per-repository emission allocation breakdown to gitt miner score.

The JSON output now includes an allocation_breakdown array showing each relevant repository’s emission slice, PR/issue split, miner scores, and allocated rewards. The normal table output also includes a compact repo allocation table.

This makes the final blended reward easier to understand after repo-bounded emission allocation.

Related Issues

Closes #1283

Type of Change

• Bug fix
• New feature
• Refactor
• Documentation
• Other (describe below)

Testing

• Tests added/updated
• Manually tested

.venv/bin/python -m pytest tests/validator/test_blend_emission_pools.py tests/cli/test_miner_score.py
.venv/bin/python -m ruff check gittensor/validator/emission_allocation.py gittensor/cli/miner_commands/score.py tests/validator/test_blend_emission_pools.py tests/cli/test_miner_score.py
.venv/bin/python -m ruff format --check gittensor/validator/emission_allocation.py gittensor/cli/miner_commands/score.py tests/validator/test_blend_emission_pools.py tests/cli/test_miner_score.py
git diff --check

Results:

• 34 passed
• Ruff check passed
• Ruff format check passed
• Diff whitespace check passed

Checklist

• Code follows project style guidelines
• Self-review completed
• Changes are documented (if applicable)