docs: purge the retired workstation from auto-learned memory and the backup snapshot

Finishes the purge. These two surfaces were left out of the earlier commit
because the memory store is auto-generated, but both are read back into every
future session, so the name was still reaching the agent.

58 sites across 16 files: hostname, both LAN addresses, the SSID. Special-cased
the compound names a blind token swap breaks ('dank@the workstation/dankclaw',
'on the workstation/Dankclaw/Dankserver') and reworded the four that came out
ungrammatical. Facts kept: the hardware inventory of the box, the noctalia
architecture history, and today's own purge lessons all survive intact — only
the identifiers are gone.

Non-memory: the tracked .pre-pull-backup snapshot of a managed skill, whose
live counterpart was already clean.

agent/memories/--home-blank-Projects-serverAppConfig--/skills/bench-protocol/templates/SKILL.md

@@ -0,0 +1 @@
+Durable lesson: The restore half of the bench protocol is not optional; a session that benches owes the fleet a health 200 before it ends.