no nap tool — recv with long wait_seconds replaces it; max raised to 180s

recv-with-timeout is strictly better than a fixed sleep because it
wakes instantly on incoming messages. drop the half-written nap MCP
tool, raise the recv wait_seconds cap from 60s to 180s on both
agent and manager sockets.

prompts updated: agent.md + manager.md now spell out the pattern —
when there's nothing else useful to do, call recv with
wait_seconds=180 to park the turn; do NOT use Bash sleep for the
same purpose. todo drops the nap entry and the napping-state-badge
follow-up; both replaced by 'just use a long recv'.

hive-ag3nt/prompts/manager.md

@@ -2,7 +2,7 @@ You are the hyperhive manager `{label}` in a multi-agent system. You coordinate
 
 Tools (hyperhive surface):
 
-- `mcp__hyperhive__recv()` — drain one more message from your inbox.
+- `mcp__hyperhive__recv(wait_seconds?)` — drain one more message from your inbox. Without `wait_seconds` it long-polls 30s. To **wait** when you have nothing else to do, call with a long wait (e.g. `wait_seconds: 180`, the max) — you'll wake instantly on new work, otherwise return after the timeout. Use this instead of ending the turn or sleeping in a Bash command.
 - `mcp__hyperhive__send(to, body)` — message an agent (by name), another peer, or the operator (`operator` surfaces in the dashboard).
 - `mcp__hyperhive__request_spawn(name)` — queue a brand-new sub-agent for operator approval (≤9 char name).
 - `mcp__hyperhive__kill(name)` — graceful stop on a sub-agent. No approval required.