feat!: check C runtime and variadic interface contracts - #27
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Implement RFC 0024 so checked code can validate comparisons, searches, descriptor and stream I/O, formatted output, and variadic forwarding. Model initialized prefixes, promoted format types, independent cursors, cleanup and standard-stream lifetime across source units, objects and caches. Use checked encoding 6, summary format 19 and sidecar format 20. Reuse bounded immutable call ledgers and expanded report paths to contain the added explanation cost without changing proof or analysis budgets. Validation: 1171/1171 tests in both Debug and ASan/UBSan, 25 strict lint translation units, and 51/51 frozen runtime cases. Preserve all 130 baseline-complete corpus identities and gain 12. Uncached/cold/warm reports are equivalent; warm reuse has zero function analyses and 51 cache hits. Ordinary median time and RSS ratios are 0.9849 and 0.9884. Both Lua checked runs finish below 600 seconds with narrow margins. Retain failed timing attempts and the cJSON comparison and Jansson lifecycle misses in evidence. Design: docs/rfcs/0024-checked-runtime-contracts.md Evidence: docs/validation-rfc0024.md
Copy the guarded argument-list input, format precision, and search bound optionals directly. This satisfies bugprone-optional-value-conversion in the Linux clang-tidy job while preserving the RFC 0024 contract values. Validate the Debug build, strict lint and formatting for all three files, runtime unit tests, source/object/cache evaluations, and the full lit suite.
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