fix: expand money realizer coverage

[aryamantodkar]

Summary

• Add a local MONEY realizer for compositional major and minor currency amounts.
• Cover signs, currency aliases, ISO and legacy names, grouping, punctuation, hyphenated speech, and thousand/lakh/crore/million/billion/trillion scales.
• Add evaluation-only MONEY representation equivalence for symbols, placement, grouping, padding, and scale abbreviations.
• Preserve currency identity: $ and USD are equivalent, but $, CAD, A$, and other currencies are not interchangeable.
• Require complete MONEY-span consumption; unrelated suffixes such as tomorrow, weight, or only are rejected.
• Update the README, coverage documentation, and focused Rust/Python tests.

Invariants

A complete MONEY span must produce a deterministic semantic amount and currency when its spoken value is valid. Display aliases remain evaluation-only and do not expand runtime candidates. Evaluation compares both normalized amount and currency identity.

Audit evidence

All seven Google TN shards were rerun: 214,728 MONEY rows total, with 21,239 exact and 191,379 identity-aware representation-equivalent results. The 2,047 mismatches are underdetermined annotations where generic spoken dollar/cent is paired with an explicit non-USD target such as A$ or €; the source does not identify that currency. The 63 None rows are malformed sil/pa annotations. The remaining 212,618 determinate, non-malformed rows have 100% exact-or-equivalent coverage.

Validation

• uv run ruff format --check .
• uv run ruff check .
• uv run pytest (6 passed)
• cargo fmt --manifest-path rust/Cargo.toml -- --check
• cargo test --manifest-path rust/Cargo.toml (40 passed)
• uv build