feat: repository emissions by bounded repo shares

[aliworksx08]

Summary

Closes #1215.

Repository allocation moves from an unbounded per-PR weight multiplier to repo-level emission_share slicing at round aggregation. Each repo receives emission_share * OSS_EMISSION_SHARE, then distributes that slice within the repo by PR earned score and issue-discovery earned score. PR/issue sub-slices spill only within the same repo, while fully inactive repo slices and registry slack recycle.

Changes

• Rename registry allocation from weight to emission_share.
• Add issue_discovery_share with same-repo PR/issue spill behavior.
• Collapse emissions to OSS_EMISSION_SHARE = 0.90 and ISSUES_TREASURY_EMISSION_SHARE = 0.10.
• Remove repo weight from PR scoring, issue-discovery scoring, and open-PR collateral scoring.
• Recycle registry slack and fully inactive repo slices instead of using a fixed recycle baseline.
• Preserve neutral storage compatibility fields for repo_weight_multiplier and discovery_repo_weight_multiplier.
• Match live PR/issue repo names case-insensitively against lowercase registry keys.
• Add tests for bounded allocation, slack recycle, PR/issue spill, disabled sides, case-insensitive repo matching, and loader invariants.

Out of scope

• Open-PR collateral remains a scoring concern outside repo-slice allocation; repo allocation distributes PR slices by per-PR earned score only.
• DB/schema removal for legacy multiplier fields is intentionally left out.

Type of Change

• Bug fix
• New feature
• Refactor
• Documentation
• Other: emission policy change

Testing

• Tests added/updated
• Manually tested

Validation:

uv run pytest tests/validator/test_load_weights.py tests/validator/test_emission_share_allocation.py tests/validator/oss_contributions/mirror/test_scored_pr.py tests/validator/oss_contributions/mirror/test_scoring.py tests/cli/test_miner_score.py -q
# 152 passed

uv run pyright gittensor
# 0 errors, 0 warnings, 0 informations

uv run ruff check gittensor/validator/forward.py tests/validator/test_emission_share_allocation.py tests/validator/test_load_weights.py
# All checks passed

uv run ruff format --check gittensor/validator/forward.py tests/validator/test_emission_share_allocation.py tests/validator/test_load_weights.py
# 3 files already formatted

git diff --check
# clean

Checklist

• Code follows project style guidelines
• Self-review completed
• Changes are documented, if applicable```

[aliworksx08]

hi, @anderdc, can you review my PR, plz?

[anderdc]

Closing — see #1251 for the documented copying of @seroperson's vulture-integration branch (14 of 14 touched files a subset of the source PR, 12 byte-identical, and the linked issue body explicitly cites the source branch by name). With that on the public record, we can't extend the good-faith review this PR would otherwise need.

Closing.