feat(encyclopedia): state v2 with per-batch and keep memory

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Wiki.Application/Encyclopedia/EncyclopediaReconciler.cs

@@ -85,7 +85,7 @@ public sealed class EncyclopediaReconciler(
         if (plan is null)
         {
             log.LogWarning("No usable article plan; no article is written or deleted");
-            return await FinishAsync(changes, new EncyclopediaState(subjects, failedPlan), stateText,
+            return await FinishAsync(changes, new EncyclopediaState(subjects, failedPlan, state.FailedBatches, state.KeptArticles), stateText,
                 new ReconcileSummary(0, 0, 0, 0, 0, false, "no-plan", null), ct);
         }
 
@@ -162,7 +162,7 @@ public sealed class EncyclopediaReconciler(
             }
         }
 
-        var summary = await FinishAsync(changes, new EncyclopediaState(subjects, failedPlan), stateText,
+        var summary = await FinishAsync(changes, new EncyclopediaState(subjects, failedPlan, state.FailedBatches, state.KeptArticles), stateText,
             new ReconcileSummary(plan.Articles.Count, written, deleted, rejected, remembered, stopped, null, null), ct);
         failure?.Throw();
         return summary;

src/Wiki.Application/Encyclopedia/EncyclopediaState.cs

@@ -22,9 +22,21 @@ public sealed record PlanAttempt(string NoteSetFingerprint, DateTimeOffset At);
 /// What the nightly job remembers between runs (<c>articles/_state.json</c>), so it does not pay again
 /// for the same failure. An attempt is repeated only when its fingerprint changes.
 /// </summary>
-public sealed record EncyclopediaState(IReadOnlyDictionary<string, SubjectAttempt> Subjects, PlanAttempt? FailedPlan)
+/// <remarks>
+/// <c>FailedBatches</c>: fingerprint of an assignment batch whose reply was unusable → when.
+/// <c>KeptArticles</c>: article slug → <see cref="SubjectFingerprint"/> at which the fold call answered keep.
+/// </remarks>
+public sealed record EncyclopediaState(
+    IReadOnlyDictionary<string, SubjectAttempt> Subjects,
+    PlanAttempt? FailedPlan,
+    IReadOnlyDictionary<string, DateTimeOffset> FailedBatches,
+    IReadOnlyDictionary<string, string> KeptArticles)
 {
-    public static EncyclopediaState Empty => new(new Dictionary<string, SubjectAttempt>(), null);
+    public static EncyclopediaState Empty =>
+        new(new Dictionary<string, SubjectAttempt>(), null, new Dictionary<string, DateTimeOffset>(), new Dictionary<string, string>());
+
+    public static string BatchFingerprint(IReadOnlyList<Document> notes) =>
+        Hash(Prompts.Version.ToString(), notes.Select(n => $"{n.Slug}@{n.ContentHash}").Order(StringComparer.Ordinal));
 
     public static string NoteSetFingerprint(IReadOnlyList<Document> notes) =>
         Hash(Prompts.Version.ToString(), notes.Select(n => n.Slug).Order(StringComparer.Ordinal));
@@ -35,7 +47,7 @@ public sealed record EncyclopediaState(IReadOnlyDictionary<string, SubjectAttemp
         var sources = planned.Sources
             .Select(s => $"{s}@{hashes.GetValueOrDefault(s, "")}")
             .Order(StringComparer.Ordinal);
-        return Hash([Prompts.Version.ToString(), planned.TitleDe, planned.TitleEn, planned.Category.ToString(), .. sources]);
+        return Hash([Prompts.Version.ToString(), planned.TitleDe, planned.TitleEn, planned.Category.ToString(), planned.Scope, .. sources]);
     }
 
     private static string Hash(string first, IEnumerable<string> rest) => Hash([first, .. rest]);
@@ -62,7 +74,9 @@ public static class EncyclopediaStateJson
             var s = JsonSerializer.Deserialize<EncyclopediaState>(json, Options);
             if (s?.Subjects is null) return EncyclopediaState.Empty;
             var subjects = s.Subjects.Where(kv => kv.Value is not null).ToDictionary(kv => kv.Key, kv => kv.Value);
-            return new EncyclopediaState(subjects, s.FailedPlan);
+            var failedBatches = (s.FailedBatches ?? new Dictionary<string, DateTimeOffset>()).ToDictionary();
+            var kept = (s.KeptArticles ?? new Dictionary<string, string>()).Where(kv => kv.Value is not null).ToDictionary();
+            return new EncyclopediaState(subjects, s.FailedPlan, failedBatches, kept);
         }
         catch (JsonException)
         {