The rulespec compiler was writing serde_yaml::to_string(&compiled) into
rulespec.compiled.dl files — just YAML, not datalog at all.
Added format_datalog_program() that produces proper Soufflé-style datalog:
- .decl relation declarations (claim_value, claim_length, predicate_pass, predicate_fail)
- Fact assertions from the envelope
- Rules for all 9 predicate types (exists, not_exists, equals, contains,
greater_than, less_than, min_length, max_length, matches)
- .output directives for query results
Updated verify_envelope() to call the new function instead of
serde_yaml::to_string(). Added 8 unit tests covering all rule types,
edge cases, and the butler rulespec example.
51dfe71a2b