compiler.ts: normalizeOptionValue now rejects NaN numbers and empty
strings. Previously typeof NaN === 'number' passed through and
propagated into option values, causing predicate comparisons like
value >= NaN to produce silent wrong results.
grammar.ts: parseAssertion now emits console.warn when silently
skipping unexpected tokens or failed clauses. Previously these
returns-null were invisible to developers.
454 solver+DSL + 57 E2E tests pass.
John Dvorak
07ed316135