Phase F F2/F3: quarantine NOT deletable — the lever proved the drop is load-bearing; registry keeps the fact

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Td4ujboGuAw26jvbDQzehj

.ci-cache-epoch

@@ -1 +1 @@
-14
+15

docs/features/async/22-absorbing-libcontext.md

@@ -1186,6 +1186,40 @@ Flake watch: `ngspice-probe` "bg_run streams events live" has now failed twice
 under full-suite parallel load and passed 4/4 solo both times — a de-flake
 candidate, not a regression.
 
+### F2/F3 — the quarantine is NOT deletable, and the lever proved exactly why (2026-08-09)
+
+The deletion was BUILT and MEASURED, not assumed. What was tried: the registry
+learned the shim's one private fact — "this fiber's body holds an in-flight
+in-place handleSleep park" (`Context::inplace_parks`, fed through
+`wxWasmSchedInplaceParkBegin/End` from the handleSleep wrap at park start/end) —
+`fiber_enterable()` narrowed on it, a registry-informed refusal was added in
+`jump_fcontext` (`jump-refused-inplace`), and the shim's
+consume-once/quarantine block was deleted with the lever spec flipped to
+assert the new refusal.
+
+**Measured verdict: scenario 1 (direct mid-park poke) works — refused at C++,
+body completes. Scenario 2 (the laundered poke) FAILS on a mechanism the
+quarantine was silently covering:** under staged attribution rot the SECOND
+coroutine's `return_to` is poisoned toward the parked fiber, so its
+YIELD-BACK jumps into it. A C++-level refusal answers with the ghost contract
+— which GHOST-RESUMES the yielding coroutine, and it runs to completion
+(`phase2` overshoots 1→2). The quarantine's drop-at-finishContextSwitch
+leaves the yielding side properly suspended — for a misrouted yield-back,
+drop is the only correct recovery a non-invocation-aware layer can make.
+
+**Deleted the deletion; kept the knowledge.** Landed and kept: the registry's
+in-place-park fact + Begin/End plumbing (the fiberStackParks counter now
+attributes parks to contexts), the `fiber_transfer` refusal for inplace-parked
+targets (the star's real lane, where attribution cannot rot), the
+`fiber_enterable` narrowing, and the divergence beacons that now light up the
+laundering (`sched-divergence-current/enterable`, `FIBER-SWAP-NONENTERABLE`).
+The quarantine block is restored verbatim with a header naming its remaining
+duty. **Prerequisite for the real deletion, now precisely named:
+registry-authoritative jump attribution** (the gap-3 redesign — libcontext
+needs a sched-id→context reverse map so a divergent `old` side is corrected at
+the jump instead of poisoning `return_to`). Until then, `fiber-resume-park`
+scenario 2 stays pinned on the quarantine beacon — deliberately.
+
 ### Prod-provider smoke (2026-08-08) — done, with one pre-existing red bisected
 
 Against the live web stack (playwright-web config, reference backend :3060):

kicad

@@ -1 +1 @@
-Subproject commit 452eb5260d8a73c2bd0dff8d2a53ab2c05f116be
+Subproject commit 6e6cf51027a5b045629518935d78a7683b43535a

scripts/common/shims/asyncify-scheduler.js

@@ -521,20 +521,28 @@ if (typeof Asyncify !== "undefined" && !globalThis.__wxSchedulerInstalled) {
       if (Asyncify.state !== 0) {
         return __originalHandleSleep(startAsync);
       }
-      // Phase E telemetry (doc 22 §5): count fresh in-place parks that begin
+      // Phase F (doc 22 §10 F2/F3): report every fresh in-place park to the
-      // on a NON-main stack (tool coroutine / scheduler context). Must reach
+      // REGISTRY. Begin() returns the owning context id (0 = main stack);
-      // ZERO at the flip — until then it measures the remaining doc-19-class
+      // while recorded, fiber_enterable()/fiber_transfer refuse entering that
-      // exposure. Leaf probe into wasm; state is 0 here so no unwind is in
+      // context — the registry-owned replacement for the deleted quarantine.
+      // Also the Phase E telemetry: fiberStackParks must be 0 at the flip's
+      // repro gate. Leaf probe into wasm; state is 0 here so no unwind is in
       // flight yet.
+      var parkOwnerCtx = 0;
       try {
-        if (Module["_wxWasmProbeOnFiberStack"] && Module["_wxWasmProbeOnFiberStack"]()) {
+        if (Module["_wxWasmSchedInplaceParkBegin"]) {
-          AsyncifyScheduler.inplaceParksOnFiberStack++;
+          parkOwnerCtx = Module["_wxWasmSchedInplaceParkBegin"]() | 0;
-          __rec("inplace-park-on-fiber-stack n=" + AsyncifyScheduler.inplaceParksOnFiberStack);
+          if (parkOwnerCtx) {
+            AsyncifyScheduler.inplaceParksOnFiberStack++;
+            __rec("inplace-park-on-fiber-stack ctx=" + parkOwnerCtx
+                  + " n=" + AsyncifyScheduler.inplaceParksOnFiberStack);
+          }
         }
       } catch (e) { /* probe must never break a park */ }
       var sleepCtx = {
         capturedData: null,
         cleanedUp: false,
+        parkOwnerCtx: parkOwnerCtx,
         rootOwned: (typeof Fibers === "undefined")
           || (!Fibers.__inFiberEntry
               && !(Asyncify.__wakingOwnerFiber || false)),
@@ -544,6 +552,14 @@ if (typeof Asyncify !== "undefined" && !globalThis.__wxSchedulerInstalled) {
       var cleanup = function () {
         if (sleepCtx.cleanedUp) return;
         sleepCtx.cleanedUp = true;
+        if (sleepCtx.parkOwnerCtx) {
+          try {
+            if (Module["_wxWasmSchedInplaceParkEnd"]) {
+              Module["_wxWasmSchedInplaceParkEnd"](sleepCtx.parkOwnerCtx);
+            }
+          } catch (e) { /* never break a wake */ }
+          sleepCtx.parkOwnerCtx = 0;
+        }
         var idx = Asyncify.__pendingSleepContexts.indexOf(sleepCtx);
         if (idx !== -1) Asyncify.__pendingSleepContexts.splice(idx, 1);
       };
@@ -625,6 +641,13 @@ if (typeof Asyncify !== "undefined" && !globalThis.__wxSchedulerInstalled) {
   // --- stale-fiber-rewind guard (ported from handlesleep.js; semantics
   // unchanged — these encode the consume-once/quarantine contracts of
   // docs/features/async/16) + trampoline heal ownership -------------------
+  // Phase F F2/F3 (doc 22 §10, 2026-08-09): deletion was built, measured and
+  // REVERTED. The registry now carries the in-place-park fact
+  // (wxWasmSchedInplaceParkBegin/End) and refuses on the transfer lane, but
+  // the quarantine's DROP is still the only correct recovery for a misrouted
+  // yield-back under attribution rot (a C++-level refusal ghost-resumes the
+  // yielding coroutine — measured as the lever's phase2 overshoot). This
+  // block stays until attribution is registry-authoritative (gap 3).
   if (typeof Fibers !== "undefined"
       && typeof Fibers.finishContextSwitch === "function"
       && !Fibers.__staleRewindGuardInstalled) {

wxwidgets

@@ -1 +1 @@
-Subproject commit a8d9ece31f9130dc5b8726924fd2f6f34f1b305f
+Subproject commit 68787c1f4418998504a7d0f3b806a494f0c8d109