Add a real logic-test gate so future pure-sx game logic fails the build on a bad assertion: - tests/test.sx: `expect(cond, msg)` assert helper — prints a greppable `FAIL <file>:<line>: <msg>` and exits non-zero via process.exit on failure. - tools/run_tests.sh: snapshot runner mirroring sx/tests/run_examples.sh; runs each tests/<name>.sx and diffs stdout + exit code against tests/expected/. Exits 0 iff all tests pass. - tests/arith.sx (+ expected snapshots): seed passing sanity test. - README.md: document both halves of the gate — logic runner and the reproducible ios-sim build/launch sequence (with device discovery).
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