names: bring in the registrar as it ran on cs

The deployed registrar carried changes made directly on the server between
Oct 10 and Oct 14 that never reached the repo:

- forward() delivers to the same key's current name when the paid name was
  released in the meantime (a v2 migration swaps its throwaway npub name for
  the real one seconds after a payment can settle)
- "nowhere to send" throws, so the payout stays queued instead of dropping
- the forwarder float merges small coins (consolidateFloat) before a send
  hits the input cap
- floatUpkeep skips coins already past expiry, which the server's sweeper
  has taken and whose refresh never settles

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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