- parse x-encrypted/x-owner-pubkey/x-file-keys headers in handleUploadPost
- pass encrypted and ownerPubkey to uploadFile, call insertFileKeys after
- get_file: fetch sealedKey for non-owners, block if missing, include in response
- list_files: include encrypted field per file
- add grant_file_access WS handler so owners can seal keys for peers
- update types.ts with new message interfaces and union members
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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