Fix bytecode call-site semantics

notes/bytecode_callsite_fix.md

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+# Bytecode call-site PIC + fallback gating
+
+Changes
+- Added method call PIC path in bytecode VM with new CALL_SLOT/CALL_VIRTUAL opcodes.
+- Fixed FieldRef property/delegate resolution to avoid bypassing ObjRecord delegation.
+- Prevent delegated ObjRecord mutation by returning a resolved copy.
+- Restricted bytecode call compilation to args that are ExpressionStatement (no splat/named/tail-block), fallback otherwise.
+
+Rationale
+- Fixes JVM test regressions and avoids premature evaluation of Statement args.
+- Keeps delegated/property semantics identical to interpreter.
+
+Tests
+- ./gradlew :lynglib:jvmTest
+- ./gradlew :lynglib:allTests -x :lynglib:jvmTest