feat: deterministic exit codes per error category#91
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Adds stable, scriptable exit codes so callers can programmatically distinguish failure modes: 0 - Success 1 - General / unknown (catch-all) 2 - CLI / usage error (invalid args, unknown format) 3 - I/O error (file not found, permission denied) 4 - Format / parse error (malformed input data) 5 - Mapping error (evaluation failure) 6 - Value error (type mismatch, overflow) Changes: - Add exit_code module with named constants to error.rs - Add MorphError::exit_code() method mapping each variant to its code - Update main.rs to use e.exit_code() instead of hardcoded 1 - Add unit tests for exit code correctness and uniqueness - Add integration tests (tests/exit_codes.rs) verifying each code via the CLI binary Fixes #85
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Summary
Implements deterministic, user-facing exit codes so callers can programmatically distinguish failure modes. Previously all errors exited with code 1.
Exit Code Table
Changes
src/error.rs: Addedexit_codemodule with named constants andMorphError::exit_code()method that maps each error variant to its codesrc/main.rs: Updated to usee.exit_code()instead of hardcodedprocess::exit(1)tests/exit_codes.rs: Integration tests verifying each exit code via the CLI binary (success, CLI errors, I/O errors, format errors, mapping errors, determinism)Fixes #85