* fix(rag): add proper .docx text extraction via mammoth
.docx files were classified as plain text and routed through raw-text
extraction (extractTXTText). Since .docx is a ZIP archive containing XML,
this produced garbage content in the Knowledge Base — XML tags and binary
noise instead of the actual document text.
Adds a dedicated 'docx' file type (split out of the generic 'text' bucket
in determineFileType) and a mammoth-based extractor that parses the
document XML properly.
* fix: clean up package-lock.json diff
* chore(deps): pin mammoth version
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Co-authored-by: John Cortright <jcortright@zscaler.com>
Co-authored-by: jakeaturner <jturner@cosmistack.com>
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