Retail investors can't tell how to actually lock in a fixed income yield and get whipsawed by bond funds

Summary

A self-directed investor trying to park a substantial sum for ~6 months is completely stuck: bond FUNDS (FXNAX, FTBFX) show volatility and negative returns instead of the promised yield, and they cannot figure out whether buying an individual bond and holding it to maturity actually locks the rate, whether they are 'looking at this wrong,' whether Fidelity/Vanguard even let them buy individual bonds, or whether they should just use a CD. This is a distinct, unsolved decision problem for normal investors: the entire fixed-income side of a portfolio has no plain-language 'here is how you lock a yield / what to buy / when it matures' guidance, so cash gets left idle, parked in the wrong instrument, or abandoned to a fund whose price moves against them. Existing brokers surface order tickets and yield tables but never give a calm, thesis-style verdict ('buy this 6-month T-bill/individual bond/CD at X% and here's what changes'). The pain is acute because it affects where large sums sit and it is the same entry/exit/sizing paralysis these investors feel in equities, just on the income sleeve — with no tool built for a non-professional value investor to get a clear stance and clear levels.