docs(headless): close modern runtime slice K

docs/plans/2026-07-26-modern-runtime-slice-k.md

@@ -1,7 +1,6 @@
 # Modern runtime Slice K — Linux headless and multi-session host
 
-**Status:** K0–K3 COMPLETE; K4 IMPLEMENTED, CONNECTED TERMINAL GATE ACTIVE
-2026-07-27
+**Status:** COMPLETE 2026-07-27
 **Parent:** `2026-07-24-modern-runtime-architecture.md`, Slice K
 **Authorization:** the user approved Slices F–L on 2026-07-24
 **Purpose:** run efficient automated clients on Linux without a display, GPU,
@@ -368,11 +367,13 @@ teardown.
 
 Windows and native Ubuntu Headless tests pass 67/67; the complete Release
 suite passes 8,784 tests / 5 skips. The exact `776482da` native Linux process
-has both available accounts in-world at Rynthid, zero faults/reconnect debt,
-bounded wakeups and CPU, and every sampled dimension inside the committed
-ceiling. The user requested that it remain running for observation; its
-graceful `disposed` sample is the sole remaining K4/Slice-K closeout gate.
-Evidence:
+completed ten minutes with both available accounts, 20 consecutive passing
+periodic samples, zero fault/reconnect debt, bounded CPU/wakeups/lateness, and
+every resource dimension inside the committed ceiling. SIGINT produced
+ACE-confirmed graceful logout for both accounts. The final `disposed` sample
+reported two converged Runtime roots, zero entities/inventory/host/content
+leases, disposed shared content, and `withinCeilings=true`. K4 and Slice K are
+closed. Evidence:
 `docs/research/2026-07-27-slice-k4-resource-telemetry-checkpoint.md`.
 
 - Measure a 1-session warm baseline, then 5, 10, and 30 sessions.