Bug: when a proxy host had per-host WAF explicitly disabled (enabled:false)
with waf_mode:"merge" (or no waf_mode set), resolveEffectiveWaf entered the
merge branch and returned enabled:true unconditionally, applying the global
WAF to a host the user had opted out of.
Fix: add `if (host.enabled === false) return null` at the top of the merge
branch. Explicit opt-out now takes precedence over the global setting
regardless of mode. The override mode already handled this correctly.
Also extract resolveEffectiveWaf from caddy.ts into caddy-waf.ts so it
can be unit tested. Add 12 new tests covering no-config fallback,
merge opt-out regression, merge settings combination, and override mode.
What runs without OWASP CRS: only SecRuleEngine + audit directives +
any custom_directives. The @coraza.conf-recommended and CRS includes
are gated behind load_owasp_crs (fixed in previous commit).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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