docs(headless): record K4 telemetry checkpoint

docs/plans/2026-04-11-roadmap.md

@@ -1,6 +1,6 @@
 # acdream — strategic roadmap
 
-**Status:** Living document. Updated 2026-07-27. **M3 landed; M4 is active.** M3's retail casting/UI, R6 locomotion/collision/projectile/teleport/radar rebaseline, deterministic fresh-login/portal world lifecycle, and final two-client portal observer flow are user-gated. All eight slices of the behavior-preserving ownership campaign in [`docs/architecture/code-structure.md`](../architecture/code-structure.md), their automated closeout, and the user's connected visual matrix are complete. Modern Runtime J3 canonical entity/object lifetime and J4 gameplay-state ownership are closed at `89e6b207`; J5.1 canonical selection/combat/target-mode ownership is closed at `b298f99f`, J5.2 interaction transactions at `f5f7b417`, J5.3 combat/magic intent at `20df9d15`, J5.4 local movement/outbound cadence at `aa3f4a60`, J5.5 per-session physics/remote simulation at `7e6033d0`, J5.6 projectile simulation at `2aee3356`, and J5.7 combined simulation closeout at `cdee7a4b`. J6.1 world-environment ownership is closed at `902076c0`; J6.2 canonical reveal generation and typed destination readiness is closed at `a6860d55` plus `acb845d8`; J6.3 exact F751/Position destination correlation is closed at `6a063a27`; J6.4 exact graphical-host acknowledgement and owner cleanup is closed at `18d17d8b`. J7's one graphical `GameRuntime` root is closed at `ce41efb9`, including the user's 2026-07-27 exact post-cutover visual acceptance. J8 closed Slice J at `a9a822f2` with one shared graphical/no-window root and generation-reset transaction. Slice K Linux headless/multi-session work is active; K0's tested no-presentation Windows/Linux boundary closed at `aada8a37`, K1's real portable single-session host closed at `f8cb840f`, and K2's deterministic scheduler plus complete shared bot command/event path closed at `7e8acb74` plus `38e83640`. K3 closed at `3f340125` after the shared-content/collision/isolation checkpoint, visible-terminal Windows and native Linux production runs, four-stop portal route, external-teleport handling, and user-accepted retail-observer movement. K4 30-session resource and stability work is active. Issue #225's lifestone/particle alpha comparison remains a separate rendering visual gate.
+**Status:** Living document. Updated 2026-07-27. **M3 landed; M4 is active.** M3's retail casting/UI, R6 locomotion/collision/projectile/teleport/radar rebaseline, deterministic fresh-login/portal world lifecycle, and final two-client portal observer flow are user-gated. All eight slices of the behavior-preserving ownership campaign in [`docs/architecture/code-structure.md`](../architecture/code-structure.md), their automated closeout, and the user's connected visual matrix are complete. Modern Runtime J3 canonical entity/object lifetime and J4 gameplay-state ownership are closed at `89e6b207`; J5.1 canonical selection/combat/target-mode ownership is closed at `b298f99f`, J5.2 interaction transactions at `f5f7b417`, J5.3 combat/magic intent at `20df9d15`, J5.4 local movement/outbound cadence at `aa3f4a60`, J5.5 per-session physics/remote simulation at `7e6033d0`, J5.6 projectile simulation at `2aee3356`, and J5.7 combined simulation closeout at `cdee7a4b`. J6.1 world-environment ownership is closed at `902076c0`; J6.2 canonical reveal generation and typed destination readiness is closed at `a6860d55` plus `acb845d8`; J6.3 exact F751/Position destination correlation is closed at `6a063a27`; J6.4 exact graphical-host acknowledgement and owner cleanup is closed at `18d17d8b`. J7's one graphical `GameRuntime` root is closed at `ce41efb9`, including the user's 2026-07-27 exact post-cutover visual acceptance. J8 closed Slice J at `a9a822f2` with one shared graphical/no-window root and generation-reset transaction. Slice K Linux headless/multi-session work is active; K0's tested no-presentation Windows/Linux boundary closed at `aada8a37`, K1's real portable single-session host closed at `f8cb840f`, and K2's deterministic scheduler plus complete shared bot command/event path closed at `7e8acb74` plus `38e83640`. K3 closed at `3f340125` after the shared-content/collision/isolation checkpoint, visible-terminal Windows and native Linux production runs, four-stop portal route, external-teleport handling, and user-accepted retail-observer movement. K4 resource and stability work is active; `cb512fd0` adds process-level CPU/memory/GC/descriptor/ownership/scheduler telemetry and corrects both pre-connect deadline arming and the Linux sub-millisecond scheduler busy loop. Issue #225's lifestone/particle alpha comparison remains a separate rendering visual gate.
 **Purpose:** One source of truth for where the project is and where it's going. Every observed defect or missing feature has a named phase that owns it; when something looks wrong in-game, look here to find the phase that'll address it. Implementation details live in per-phase specs under `docs/superpowers/specs/`, not in this file.
 
 ---
@@ -1808,7 +1808,12 @@ port in any phase — no separate listing here.
 > event parity closed at `7e8acb74` plus `38e83640`; K3 closed at
 > `3f340125` after the shared-content/collision/isolation checkpoint, visible
 > Windows and native Linux production runs, exact portal routing, graceful
-> teardown, and user-accepted retail-observer movement. K4 is active.
+> teardown, and user-accepted retail-observer movement. K4 is active;
+> `cb512fd0` adds one process-level resource/ownership sampling deadline,
+> exact scheduler lateness/wakeup accounting, terminal convergence reporting,
+> post-connect deadline rebasing, and the Linux sub-millisecond busy-wait
+> correction. Windows/native-Ubuntu Headless tests pass 56/56 and the complete
+> Release suite passes 8,773 / 5 skips.
 > The historical exact cutover
 > rollback remains
 > `git revert ef1d263337997bb030eadb7b8e71d73dc659907a`. Slice H is complete:
@@ -1855,7 +1860,9 @@ hitch and follows.
 > no-window Linux host and approximately 30-session target from
 > [`2026-07-26-modern-runtime-slice-k.md`](2026-07-26-modern-runtime-slice-k.md);
 > Slice L executes the graphical Linux/platform work. K0-K3 are complete and
-> K4 is active. The historical LH rows below remain the stable outcome map.
+> K4 is active. Its telemetry/CPU checkpoint is `cb512fd0`; exact fixed-binary
+> connected baselines and automated 5/10/30-root endurance gates remain. The
+> historical LH rows below remain the stable outcome map.
 
 The governing architectural rule is that a game session must not be a hidden
 `GameWindow`. Authentication, networking, world state, movement, inventory,