swarm: a soft context limit per agent, as a percent of the window, applied at turn end

docs/4-implementation/turn-loop/claude-invocation.md

@@ -164,7 +164,10 @@ The **when** for hyperhive's own policy is a `hive_claude::CompactionPolicy` inj
 `turn::make_session` builds a `PercentPolicy` that compacts once the
 model-reported context fill reaches `HIVE_COMPACT_WATERMARK_PERCENT`
 (default **75%**), falling back to `harness_state::context_window_tokens(model)`
-for the window on turns the model didn't report one. `0` disables proactive
+for the window on turns the model didn't report one. The swarm can replace
+that percent per agent with its `soft_context_percent`
+([`inference.md`](../swarm/inference.md)); `turn::SoftLimitPolicy` reads it
+for each decision. `0` disables proactive
 compaction (the reactive path always applies). The proactive path is
 best-effort — a failed checkpoint or `/compact` never fails the turn that
 already succeeded. An ACP agent gets the same policy; how it compacts is in