Implemented EXEC-002 process behavior. - Compile failures exit `3`. - Runtime failures exit `5`. - Success exits `0`. - Diagnostics remain on stderr. - Partial output is flushed and preserved before runtime errors. All 16 unit tests and three acceptance checks pass. RESULT: SUCCESS FILES CHANGED: - jq_interpreter/cli.py - tests/test_architecture.py SUMMARY: Added immediate output flushing and regression coverage for stderr-only runtime diagnostics. BLOCKERS: - None
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