When vector search isn't enough: hybrid...

"Find me the documentation for the function that handles authentication." Sounds simple. Embed the question, run a similarity search, return the top results. Except here is what pure vector search actually returns: [0.82] "Authentication is handled via JWT tokens with a 24h expiry." [0.79] "The login() function validates user credentials against the database." [0.71] "OAuth2 flow documentation for third-party integrations." [0.68] "Password hashing uses bcrypt with a cost factor of 12." All four