docs(headless): close modern runtime slice K

docs/research/2026-07-27-slice-k4-resource-telemetry-checkpoint.md

@@ -1,8 +1,7 @@
-# Slice K4 resource telemetry checkpoint
+# Slice K4 resource and endurance closeout
 
 **Date:** 2026-07-27
-**Status:** Implementation and automated gates complete; exact connected
-terminal gate active
+**Status:** COMPLETE
 **Production commits:** `cb512fd0`, `97c174fb`, `bd236ce5`, `776482da`
 
 ## Outcome
@@ -145,21 +144,29 @@ observational only.
 - Diagnostics assert no credential text and exact 1/5/10/30-root terminal
   convergence.
 
-## Remaining K4 gate
+## Exact connected terminal gate
 
-The exact `776482da` two-account process is running under the committed
-envelope. After the observer window it must receive graceful cancellation and
-emit a final `disposed` sample with:
+The exact `776482da` native Linux process ran both available accounts for ten
+minutes. It emitted 20 consecutive passing periodic samples with zero
+fault/reconnect debt and no resource-envelope violation. The final running
+sample reported 290,693,120 private bytes, 269,709,312 resident bytes,
+117,592,656 managed live bytes, 17 threads, 115 handles, 116 descriptors,
+three sockets, 79.1 waits/second, 133.3 turns/second, zero continuing
+catch-ups, 3.05 ms mean lateness, and 145.1 ms maximum lateness.
 
-- two converged Runtime roots;
-- zero in-world/reconnecting/faulted sessions;
+SIGINT entered the normal production teardown path. ACE confirmed graceful
+logout for `+Horan` and `+Acdream`. The final `disposed` sample reported:
+
+- `configuredCount=2`, `convergedRuntimeCount=2`;
+- zero in-world, faulted, or reconnecting sessions;
 - zero entities, inventory objects, and host leases;
-- zero shared-content leases with content disposed/converged;
-- `withinCeilings=true`.
+- zero shared-content leases, content disposed and converged;
+- one post-network baseline socket descriptor;
+- `withinCeilings=true` with no violations.
 
-Only then does Slice K close. Available credentials support two simultaneous
-connected accounts; 5/10/30-session scale and two-hour duration are therefore
-proved by the deterministic in-process production-owner fixtures.
+Available credentials support two simultaneous connected accounts; 5/10/30
+root scale and two-hour duration are proved by the deterministic
+production-owner fixtures. K4 and Slice K are closed.
 
 ## Rollback