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`isl.py --calls` scans on the encoding, so it can see that a call happened but not what it was called with -- the arguments live in the `local[]` staging of the preceding instructions, not in the call. Naming a built-in needs those, and it needs the calls either side, because the fixed idioms are what identify a primitive (`116 -> 101 -> 100 -> 124 -> 93` is a phase teardown, and that is how 101 was named). So this walks each stage's whole code region linearly, tracking both staging forms, and prints stage/offset/id/operands plus the neighbouring call ids. The linear walk is safe rather than assumed: it lands on every call site the independent encoding scan finds, 2846/2846 in Stage 02. `--craft` cross-tabs the operand against the squadron's craft type through `unitgroup.py --all`, which is the test that separated built-in 15's classes. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE