feat: flag apply event deduplication in core resolver and WASM guest (#517)

Co-authored-by: vahidlazio <vahidlazio@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: vahidlazio

confidence-cloudflare-resolver/src/lib.rs

@@ -160,7 +160,7 @@ impl Host for H {
 
     fn log_assign(
         resolve_id: &str,
-        assigned_flags: &[FlagToApply],
+        assigned_flags: &[FlagToApply<'_>],
         client: &Client,
         sdk: &Option<Sdk>,
     ) {