Operand-hook captures skip zero-operand ops (stmt markers, script-entry 0x259),
so the VM offset trace is filtered to argc>=1 instructions before diffing — same
subsequence both sides. +1 unit test. Default on; --full for a tick-mode capture.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Pure first_divergence + pick_scene_codebase (longest-common-prefix codebase
identification), unit-tested (test_diff_optrace.py, 4/4). CLI loads the engine
jsonl + VM json, isolates the scene's codebase, and reports the first divergence
with the mis-modeled instruction and +/-3 ops of context on each side (opcode
+ rendered line via sys4load).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
