feat(scripting): PE cache, quarantine-race fix, recovery, readiness for the out-of-process runner (lmxopcua#780 P1)

Second P1 slice of docs/plans/2026-11-09-out-of-process-script-runner-design.md; still opt-in behind
Scripting:Runner=OutOfProcess (InProcess unchanged).

- Compiled-PE cache (design §7, §14 #8): Scripting:Worker:PeCacheDir holds <dir>/pe/<id>.pe entries authenticated
  with HMAC-SHA256 under a per-node random key (<dir>/pe-cache.key, created by the host, 0600/0700 on Unix), handed to
  the worker in Hello. Entry id = SHA-256(compile fingerprint + kind + source); the fingerprint covers the Roslyn
  version, the Core.Scripting build (analyzer, wrapper, stack guard), the sandbox reference set and the runtime. Edited,
  truncated, other-key or renamed entries are rejected, deleted and recompiled; the worker never loads unverified bytes.
  Pruned by recency at startup (30 d / 50 000). ScriptEvaluator splits into CompileToImage + FromImage. Measured on
  40 scripts, restart to every first result: macOS 820 ms no cache / 840 ms empty / 85 ms warm;
  windev (Windows) 9.5 s / 9.4 s / 1.0 s.
- Quarantine race: WorkerConnection runs exit attribution synchronously BEFORE completing the evaluations/loads it held
  (and before Exited), and the shard passes it straight to the runner — a kill strike is in place before the killed
  key's slot is released.
- Supervision: a dead worker restarts by itself after its backoff; Unavailable outcomes carry ScriptRunOutcome.Recovery
  (-> VirtualTagEvalResult.RetryWhen) and the VT actor / Calculation driver re-evaluate once against current inputs when
  it completes. Isolation worker stops after Scripting:Worker:IsolationIdleTimeout (10 min). Keys compiling when a
  worker dies are suspects too (isolation finds a poison compile and quarantines it). Startup orphan sweep by launch
  marker: kills only a process whose marker's host is gone and whose pid + start time + image match.
- Crash-loop circuit (Scripting:Worker:CircuitOpenAfter, 2 min): runner Unavailable, one Error, evaluations answered
  at once while shards keep retrying at the cap.
- Observability (§10): otopcua.script.runner.state, worker.up/inflight/queue_depth/heap_bytes (shard),
  ipc.roundtrip + eval.duration (kind), compile{cache}, isolation.suspects, exits reason=idle. `script-runner` health
  check on the ready tier, at worst Degraded (§14 #12: degraded but still ready).

Left on #780: self-contained worker publish, installer (account, pipe ACL, firewall), docker-dev live drill,
scripted-alarm seam, the §4.5 per-seam batch submit, the §8 perf harness.

Tests: SupervisionTests, PeCacheStoreTests/PeCacheWorkerTests (real workers), ScriptRunnerHealthCheckTests, VT + Calc
recovery seam tests; 14 mutations each turned their test red.

Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Calculation.Tests/CalculationDriverScriptRunnerTests.cs

@@ -94,6 +94,38 @@ public sealed class CalculationDriverScriptRunnerTests
         scriptFault!.Snapshot.StatusCode.ShouldBe(StatusBadInternalError);
     }
 
+    /// <summary>
+    ///     Design §9: a calc tag whose run was a runner failure is re-evaluated when the runner recovers, against the
+    ///     CURRENT inputs, with no input change. Mutation check: without the driver arming
+    ///     <c>RetryWhen</c> the tag stays BadResourceUnavailable.
+    /// </summary>
+    [Fact]
+    public async Task A_runner_unavailable_result_is_re_evaluated_with_current_inputs_when_the_runner_recovers()
+    {
+        var runner = new FakeRunner();
+        var recovered = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
+        runner.Outcomes.Enqueue(ScriptRunOutcome.Unavailable(ScriptRunOutcome.WorkerRestartedReason) with { Recovery = recovered.Task });
+        runner.Outcomes.Enqueue(ScriptRunOutcome.Ok(33.0));
+        var (driver, published) = Build(runner, "return (double)ctx.GetTag(\"src/a\").Value * 3;");
+        await driver.InitializeAsync("{}", TestContext.Current.CancellationToken);
+
+        driver.OnDependencyValue("src/a", 11.0, StatusGood, DateTime.UtcNow);
+        await Settle(driver);
+        published.TryDequeue(out var unavailable).ShouldBeTrue();
+        unavailable!.Snapshot.StatusCode.ShouldBe(StatusBadResourceUnavailable);
+        runner.Invocations.Count.ShouldBe(1);
+
+        recovered.SetResult();
+        var deadline = DateTime.UtcNow + TimeSpan.FromSeconds(10);
+        while (DateTime.UtcNow < deadline && published.IsEmpty) await Task.Delay(10, TestContext.Current.CancellationToken);
+        await Settle(driver);
+        published.TryDequeue(out var good).ShouldBeTrue("re-evaluated on recovery with no input change");
+        good!.Snapshot.StatusCode.ShouldBe(StatusGood);
+        good.Snapshot.Value.ShouldBe(33.0);
+        runner.Invocations.Count.ShouldBe(2);
+        runner.Invocations.Last().Inputs["src/a"].Value.ShouldBe(11.0, "the current input");
+    }
+
     [Fact]
     public async Task The_passthrough_fast_path_never_reaches_the_runner()
     {