Config/Compaction: expose safeguard preserve and quality settings (#25557)

Merged via squash.

Prepared head SHA: ea9904039a
Co-authored-by: rodrigouroz <384037+rodrigouroz@users.noreply.github.com>
Co-authored-by: jalehman <550978+jalehman@users.noreply.github.com>
Reviewed-by: @jalehman

src/agents/pi-embedded-runner/extensions.ts

@@ -87,6 +87,7 @@ export function buildEmbeddedExtensionFactories(params: {
       qualityGuardEnabled: qualityGuardCfg?.enabled ?? false,
       qualityGuardMaxRetries: qualityGuardCfg?.maxRetries,
       model: params.model,
+      recentTurnsPreserve: compactionCfg?.recentTurnsPreserve,
     });
     factories.push(compactionSafeguardExtension);
   }