hive-agent: let an agent compact from 40% context usage instead of 66%

docs/4-implementation/turn-loop/mcp.md

@@ -105,7 +105,7 @@ hive_name?, swarm_name?, matrix_accounts? }`. `matrix_accounts` is a
 - `compact` — queues a compaction of the current session; the only way to
   request one. No args. Gated server-side on the last completed
   turn's context usage: refused (with an explanation, no side effect)
-  unless usage is above 66% of the effective context window. On a
+  unless usage is above 40% of the effective context window. On a
   pass, queues the deferred `compact_pending` flag — consumed at the end
   of the current turn, so it never
   races a live claude process, and the usual pre-compaction