chore: ruff format after mypy fixes

chore: apply ruff format

fix: bind to 0.0.0.0 for Docker, add __main__ guard, fix libgdk-pixbuf dep

Add mcp-taxonomy adapter module

Security hardening: SSRF validation, XSS escapes, rate limiting, proxy default 127.0.0.1, path traversal, webhook validation, security headers

Add Nova-Rules patterns: malware keywords, policy puppetry, Claude triggers, scareware, weaponized code (10 categories total)

Extend Red Team Lab with steganographic embedding methods (bidi, zalgo, stego markers, base64, hex, image LSB)

Add Steganographic Detection Engine: 4 new detectors (unicode_adv, stego_markers, entropy, image_stego) + tests + fixtures

Initial release: Palisade Scanner v0.1.0 — web content security for AI agents