Summary

• Multi-worker parallelism: Spawns one Bun worker per CPU core instead of a single worker. First match wins, all others are killed. Gives ~Nx wall-clock speedup on multi-core machines.
• Early-exit in hot loop: Inlined quickRoll() with per-attribute checks — mismatches skip remaining RNG calls immediately. For a legendary target (~1% rarity), 99% of iterations now bail after the first check.
• Reduced IPC overhead: Progress reporting interval bumped from 25K to 100K iterations.
• Progress display: Shows [N cores] during search and total attempts across all workers on completion.

Compatibility

• os.availableParallelism is accessed as a runtime property check (not a named import) to stay compatible with Node >=18.0 as declared in package.json.

Test plan

• Run any-buddy interactively and verify multi-core progress display ([N cores])
• Verify search completes and correctly patches the binary
• Test on Node 18.x to confirm no import errors
• Compare search times vs main branch for a rare+ target

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