perf(origin): bound scanner concurrency and improve timeout control

[mkilijanek]

Summary

Introduce bounded parallelism and timeout controls in origin-IP scanner orchestration.

Why

• avoids unbounded concurrent scanner execution
• reduces risk of resource spikes and long-tail hangs
• improves predictability for recon workflows

Change

• add bounded scanner concurrency control
• tighten scanner timeout handling in orchestration path

Validation

• python3 -m py_compile evilwaf.py core/*.py chemistry/*.py

Provenance

• cherry-picked with -x from fork commit 669a1a5

[mkilijanek]

Merge order note: please merge after #18.\n\nDepends on: #18