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fix: update tree-sitter parser source and improve initialization robustness

fix: implement staggered throttling and sequential file processing for free tier

debug: add detailed error logging to AI attempts

fix: enable gh auth, strengthen audit intensity and enable remedy PRs

fix: implement robust token optimization and gh cli support for Groq/HF

fix: ensure git version check uses valid directory to avoid ENOENT

chore: optimize temp storage, caching and file retrieval for HF hosting

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