fix(native): lower version gate for native orchestrator (#867)

* fix(native): lower version gate to allow native orchestrator for ≥3.9.0

PR #865 fixed the Rust incremental purge (join-based SQL, correct
deletion order, scoped removal detection). The version gate in
shouldSkipNativeOrchestrator was set to <= 3.9.0 as a safety measure.
Now that the purge is correct, lower the gate to < 3.9.0 so that
addon v3.9.0+ uses the native orchestrator path.

Closes #866

* fix: raise version gate to 3.10.0 to match next addon release (#867)

The published v3.9.0 native addon binaries were built before PR #865
merged the Rust incremental purge fixes. Gate on < 3.10.0 so the
native orchestrator stays disabled until addon binaries that include
the fixes are published.

Author: carlos-alm

src/domain/graph/builder/pipeline.ts

@@ -275,7 +275,7 @@ interface NativeOrchestratorResult {
 function shouldSkipNativeOrchestrator(ctx: PipelineContext): string | null {
   if (process.env.CODEGRAPH_FORCE_JS_PIPELINE === '1') return 'CODEGRAPH_FORCE_JS_PIPELINE=1';
   if (ctx.forceFullRebuild) return 'forceFullRebuild';
-  const orchestratorBuggy = !!ctx.engineVersion && semverCompare(ctx.engineVersion, '3.9.0') <= 0;
+  const orchestratorBuggy = !!ctx.engineVersion && semverCompare(ctx.engineVersion, '3.10.0') < 0;
   if (orchestratorBuggy) return `buggy addon ${ctx.engineVersion}`;
   if (ctx.engineName !== 'native') return `engine=${ctx.engineName}`;
   return null;