feat(kvb-org): add the night cycle to run one agent under token limits

kvb-org-evening and kvb-org-sunset narrow the organisation to the session the operator types them in; kvb-org-sunrise undoes it. night.py keeps the state in <council root>/night.json: set makes the caller active and lists the other live sessions, status tells each session its part (active, awake, relax, sleep), wake lifts one session alone, clear ends the night; a missing or invalid state means day. Evening messages every other session to run kvb-agent-relax (finish the task, end its loops, start nothing); sunset messages them in waves of three to run kvb-agent-sleep (park at the next safe point, never cut a running job short, end loops, write a ten-line handover into the project's memory directory, reply asleep), and the operator then sets inbound messages to hold. At night the active session admits its own runs through watch.py and leaves the sleepers' offices alone. Sunrise switches messages back to accept, clears the state and sends kvb-agent-wakeup, which restores loops, jobs and roles from the handover; the operator can also wake one session alone by typing it there.

A peer's request to do less now needs no operator approval in the kvb-org-organize Peer protocol, and kvb-org-robot stops a run at its next safe point when the night reaches it. The README gains the agent category's state meaning and the new nodes; test_night covers set, status, wake, clear and a bad state.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

skills/kvb-org-robot/SKILL.md

@@ -18,7 +18,10 @@ Operate as an autonomous robot: given a goal, reach it without hand-holding.
   while any part of the goal is unmet — premature termination is forbidden. A
   blocker is something to solve or route around, not a reason to quit; if one
   step is genuinely, externally impossible, surface exactly why and keep working
-  on everything else until nothing solvable remains.
+  on everything else until nothing solvable remains. The one exception is the
+  operator's night: when `kvb-org-evening` or `kvb-org-sunset` reaches this
+  session, the run stops at its next safe point through `kvb-agent-relax` or
+  `kvb-agent-sleep`, and `kvb-agent-wakeup` resumes it from the handover.
 - **Stay inside your clearance.** Use ONLY commands you are pre-authorized to
   run. Never invoke anything the agent or tool settings mark as denied or as
   requiring per-invocation approval (ask) — no commit, push, deploy, or other