[AdaWorldAPI]

Adds crates/ogar-loco/examples/interpret_probe.rs: a minimal interpreter over ogar-loco's shared computational core (arithmetic, logic, variables, IF/IF_ELSE/REPEAT/WHILE/REPEAT_UNTIL), run over four hand-authored real algorithms (GCD, summation, FizzBuzz-style classification, Collatz step counts) across multiple real inputs each, twice per input for a determinism check.

This is PROBE-LOCO-INTERPRETER-1 as specified in lance-graph's .claude/brainstorms/2026-08-22-behavioral-ir-fathoming.md §F (companion lance-graph PR: AdaWorldAPI/lance-graph#992). Before this, ogar-loco had a byte-exact, validated, branch-capable instruction format and zero execution capability anywhere in the workspace — a crate-wide search for fn execute/eval/interpret/step/run returned nothing.

Results (44 episodes total)

• KC2 (determinism under fixed inputs): PASS
• KC3 (median episode length ≥ 5 calls): PASS, median=23
• KC4 (traces are input-dependent, not ladder_program()'s static ordering): PASS, 44 distinct call sequences across 44 episodes — this was the single most-likely-to-kill condition and it did not fire
• Independent arithmetic ground truth: all 44 episodes correct
• KC1 (the 34 lance-graph-ogar recipes have separable executable effects): explicitly NOT TESTED — this interpreter only covers the shared core below DOMAIN_FLOOR; the recipes' semantics live in lance-graph-ogar's ThoughtCtx/recipe_dispatch wiring, out of scope here.

A genuine finding surfaced while building this

Documented in the module doc, not pre-registered: the shared core's own declared pushes_result table marks VAR_SET/VAR_CHANGE as pushing a result (chainable-assignment semantics), and there is no DROP/POP primitive. That makes statements::statement_bounds (whole-body segmentation for step-mask masking) correctly refuse (DanglingOperands) any ordinary imperative "set a; set b; ..." sequence — a real, previously-untested ABI property, not a bug. This interpreter therefore does not use statement_bounds to drive execution; it walks each function body as one linear program-counter pass, treating VAR_SET/VAR_CHANGE as void statements, and uses a local backward operand-span scan (operand_span_start) only where WHILE/REPEAT_UNTIL need to re-run a condition.

cargo clippy -p ogar-loco --example interpret_probe -- -D warnings and cargo fmt -p ogar-loco are both clean.

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