Add mixed compare benchmark baseline

notes/fast_ops_optimizations_plan.md

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+# Fast Ops Optimizations Plan (Draft)
+
+Baseline
+- See `notes/nested_range_baseline.md`
+
+Candidates (not started)
+1) Primitive comparisons
+   - Emit fast CMP variants for known ObjString/ObjInt/ObjReal/ObjBool across all comparison operators.
+2) Mixed numeric ops
+   - Ensure INT+REAL arithmetic uses INT_TO_REAL + REAL op with no extra moves/boxing.
+3) Boolean conversion
+   - Skip OBJ_TO_BOOL when compiler already has a BOOL slot.
+4) Range/loop hot path
+   - Keep range iteration in INT ops, avoid accidental boxing.
+   - Confirm loop-var slots avoid re-boxing in loop bodies.
+5) String ops
+   - Extend fast path for string comparisons in hot loops.
+6) Box/unbox audit
+   - Identify remaining BOX_OBJ / OBJ_TO_* in inner loops and eliminate when safe.