Feature/Fix: Preserve lineage accounting dimensions

[iam-brain]

Summary

• retain normalized model attribution alongside complete lineage token observations
• project deduplicated input, cached input, and output totals into UTC and local daily model rows
• preserve explicit priced/unpriced state and sum long-context pricing per observation
• resolve copied equal-time attribution deterministically without changing the token fingerprint

This is the fourth isolated component of the planned Codex scanner rearchitecture. Production aggregation remains unchanged.

Validation

• swift test --filter CodexLineageLedgerTests (13 tests)
• make check
• env SDKROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX26.5.sdk make test (640 selections)
• repository review gate: no unresolved material findings

Closes #14