Replace the ledger-internals unit tests with a single test that runs the real audit against the live repo and asserts every OCR test is accounted for (mapped, unmapped-with-reason, or rust_only), printing the exact diff on failure.
Covers schema validation, AST/regex test enumeration, drift detection on both the Python and Rust sides, LedgerDriftError content, and a live-repo clean-audit guard against future drift.
