test(ir): replace contaminated 0524 IR snapshot with clean 0513 (A4.1 scaffolding fix)
The 0524-packs-generic-fn-pack-state-leak example has a #run that prints at IR-gen time, and tests/run_examples.sh captures `sx ir ... 2>&1`, so its .ir snapshot was contaminated with #run stdout (`0: len=0` ...) instead of pure IR. Remove 0524.ir — pack-state isolation (the issue-0048/0050 class) stays guarded by 0524's existing runtime .stdout/.exit, where a leaked outer pack_arg_types would corrupt the printed len= sequence. Replace it with 0513-packs-pack-mixed-comptime.ir, which is print-free at IR-gen time (clean, idempotent, path-free) and additionally locks the comptime-value mono-key path (appendComptimeValueMangle): the IR shows tagged(7,..) vs tagged(9) producing distinct monos @tagged__ct_7__pack_s64_s64_s64 / @tagged__ct_9__pack. zig build, zig build test, tests/run_examples.sh (357/0) all green.
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