[ANNOUNCE] 409k-1

[Pyry Kovanen]

%base hash (check with +vats %base, =verb %.y): 0v8.tmivg.6mnmk.2h9gl.cnicd.n9sba.k67d4.8vpa2.ve1kn.50di8.a7u66

409k-1 is a minor release with fixes to the following issues:

- Ships with dead flows created before 412k were unable to convert them to the system flow regime. These flows continued to retry every two minutes.
 
   Use this dojo command to check how many ships you have upgraded to the system flow regime:
   ```
    =+  .^  =(jug ship app=term)  %gg  /=//=/[%$]  ==  ~(wyt by `(map ship (set term))`-)
   ```
- A suspended agent that gets revived processes all local and remote pokes and subscriptions it received while it was suspended. Since 410k-3 the poke-acks and watch-acks generated during revival to local agents would never be delivered.
- Fix agent revival after emitting a %tend for writing group encrypted scry data.
- Fix a rare scenario where establishing initial contact between a comet and galaxy would fail when using directed messaging.
- We also restore the %aqua test runner to operational status with support for 409.

For full release notes see https://github.com/urbit/urbit/releases/tag/409k-1