[BUG] Kernel Panic - `decision.plan.join` is not a function

[youyoulyz]

Issue: Kernel Panic - decision.plan.join is not a function

Description

The agent crashes during the execution loop when attempting to log the plan. This occurs when the LLM provider (specifically observed with ollama/qwen3.5:27b) returns a decision.plan value that is not an Array (e.g., a String or null), causing the .join(" -> ") call to fail.

Traceback

TypeError: decision.plan.join is not a function. (In 'decision.plan.join(" -> ")', 'decision.plan.join' is undefined)
      at runAgent (/mnt/luyuzhou/droidclaw/src/kernel.ts:389:42)

Steps to Reproduce

1. Run bun run src/kernel.ts.
2. Provide a goal (e.g., "Open telegram and send hello to Cee").
3. Wait for the agent to move to Step 2.
4. If the LLM returns a non-array plan field in its JSON response, the process exits.

Suggested Fix

We should verify that decision.plan is an array before attempting to join it, or cast it to an array if it's a string.

File: src/kernel.ts
Line: 389

// Proposed defensive check
if (decision.plan) {
  const planOutput = Array.isArray(decision.plan) 
    ? decision.plan.join(" -> ") 
    : decision.plan;
  console.log(`Plan: ${planOutput}`);
}