⚡ Optimize forum ingestion with concurrent processing

[google-labs-jules]

• 💡 What: Optimized readForumThreadsFromDirectory in src/ingestion/forum/forum-reader.ts to use Promise.all for concurrent file parsing and subdirectory traversal.
• 🎯 Why: Sequential processing was bottlenecking ingestion performance.
• 📊 Measured Improvement: Benchmarking with 155 files/dirs showed an improvement from ~95ms to ~69ms (~27% faster) on local disk. Improvement is expected to be more significant on larger datasets or slower I/O.
  • Baseline: ~95ms
  • Optimized: ~69ms
  • Speedup: ~27%

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PR created automatically by Jules for task 17947646667424662319 started by @mojomast

[google-labs-jules]

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