fix(core): validate yamlWorkflow before executing cached aiAction plan

[quanru]

Summary

This PR fixes a critical bug where aiAction() could silently fail when the cache contains an empty or undefined yamlWorkflow field.

Problem

When the following conditions were met:

1. Cache was enabled and a matching cache record was found
2. The cached yamlWorkflow field was empty or undefined (due to corrupted cache, version incompatibility, or write failure)

The code would call runYaml(undefined), which would:

• Call parseYamlScript(undefined)
• Fail to parse and throw an error
• Result: aiAction() would not execute at all

Solution

Added validation to check if yamlWorkflow exists before using the cached plan:

if (
  matchedCache &&
  this.taskCache?.isCacheResultUsed &&
  matchedCache.cacheContent?.yamlWorkflow  // ✅ Validate not empty
) {
  // Safe to use cached workflow
}

// Fallback to normal execution if cache is invalid
if (matchedCache && !matchedCache.cacheContent?.yamlWorkflow) {
  debug('cache matched but yamlWorkflow is empty, will execute normally instead');
}

Changes

• Added validation for yamlWorkflow before executing cached plans
• Added debug logging when cache is matched but workflow is empty
• Gracefully falls back to normal execution when cache is invalid
• Improved type safety by removing optional chaining where value is guaranteed

Testing

• ✅ Lint checks passed
• ✅ Code follows project conventions

Related

Location: packages/core/src/agent/agent.ts:827-848

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