fix(yaml): carry style: 'llm' through LLM planner config for observability

CodeRabbit caught: compileMissionYamlWithLlmPlan omitted `style` from
the agentos plannerConfig. The agentos compiler ignores `style` when
`plan` is set, so behavior was unchanged — but downstream code that
reads plannerConfig.style for logging/telemetry would see undefined.
Set it explicitly so the choice is observable everywhere it might be
inspected.

Author: jddunn

src/orchestration/yaml-compiler.ts

@@ -657,6 +657,11 @@ async function compileMissionYamlWithLlmPlan(
       maxSteps: doc.planner.maxSteps ?? 8,
       maxIterationsPerNode: doc.planner.maxIterations,
       ...(doc.planner.parallelTools !== undefined ? { parallelTools: doc.planner.parallelTools } : {}),
+      // Carry through `style: 'llm'` so any downstream code that inspects
+      // `plannerConfig.style` for logging/telemetry sees the actual choice;
+      // the agentos compiler ignores `style` when `plan` is set, so this
+      // is observability-only.
+      style: 'llm' as const,
       plan,
     } as any);