chore: update HAWK knowledge base entry after withdrawal

[xycloops123]

Summary

• update the HAWK entry with verified attack estimates and its 29 July withdrawal from the NIST process
• record evidence level, production impact, Top 10 implications, verification date, and primary references
• link the knowledge base from the project README

Verification

• git diff --check
• confirmed all five external references return HTTP 200
• confirmed commit is unsigned (git log signature status N)

No code or runtime behavior is changed.