rieske / trans / 29993228457

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Harden process invocation, exit codes, and ownership (#57)

Replace shell system() with an argv-based Process helper that drains
stdout/stderr concurrently and fails hard on non-zero tool exits.
Propagate compile failures from Driver to main, move parsing/scanner
factories to unique_ptr, and throw from unfinished array codegen.
Add focused util/driver/codegen tests; keep production free of coverage
tooling hooks.

130 of 202 new or added lines in 9 files covered. (64.36%)

5643 of 6195 relevant lines covered (91.09%)

186846.55 hits per line