Test harness for the hosted VM's test suite, run via ./starforth --run-tests. Organized in POST (Power-On Self Test) order: unit tests → dictionary/word-category tests → integration/stress/ adversarial tests.

test_runner.c — test harness orchestration (loads and runs all modules in POST order).
test_common.c — shared test utilities.
test_contracts.c — contract-based testing infrastructure (pre/post condition assertions around word execution).

Subdirectories:

include/ — public headers for this harness.
modules/ — per-category test files; see src/test_runner/modules/README.md.