feat(graph): daily-digest (יומון) discovery layer (corpus graph PR E)

Chaim's idea: surface the downloaded "כל יום" digests in the graph. Each digest
COVERS the ruling it analyses — a corpus precedent when we have it (16), or a
synthesized gap node from its underlying_citation when we don't (269). So the
digest layer doubles as a discovery signal: it makes visible that the daily
feed overwhelmingly covers rulings NOT yet in the corpus.

Backend (web/graph_api.py — read-only, G2):
- "digest" added to VALID_NODE_TYPES (off by default).
- _digest_nodes_and_edges(): dig:<id> nodes from completed digests, `covers`
  edge → cl:precedent (linked_case_law_id in view) or → gap:<underlying_citation>
  (synthesized, deduped against the gap layer — real in-degree wins). Carries
  concept_tag (label), headline_holding (note), underlying_court/date.
- _add_digests() appends the layer with gap dedup. Wired into both build
  functions. GraphNode += note, digest_id. Gated via node_types (no app.py
  change). Validated: 16 covers→precedent, 269 covers→gap.

Frontend:
- graph.ts: GraphNodeType += "digest"; GraphEdgeType += "covers"; node fields.
- graph-filter-panel: toggle "יומונים (כל יום)" (off by default).
- graph-canvas: digest = teal node (r=4); `covers` edges teal.
- graph-node-panel: digest branch — concept + holding + court/date + link to
  /digests.

web-ui build + lint pass. Invariants: G2 (SELECT-only), UI2. api:types post-deploy.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-ui/src/components/graph/graph-canvas.tsx

@@ -51,6 +51,7 @@ const NODE_COLORS: Record<string, string> = {
   topic: "#a97d3a", // gold — hubs stand out
   practice_area: "#475569", // slate
   gap: "#94a3b8", // faint slate — research gap (not in corpus)
+  digest: "#2f6f7a", // teal — daily-digest (יומון) discovery layer
 };
 
 const TREATMENT_COLORS: Record<string, string> = {
@@ -114,6 +115,7 @@ export function colorForNode(n: GraphNode, colorBy: ColorBy): string {
 
 export function radiusForNode(n: GraphNode, sizeBy: SizeBy): number {
   if (n.type === "topic" || n.type === "practice_area") return 5;
+  if (n.type === "digest") return 4;
   if (sizeBy === "pagerank" && n.pagerank != null) {
     return 3 + Math.sqrt(n.pagerank) * 18;
   }
@@ -301,6 +303,9 @@ export function GraphCanvas({
       if (link.type === "tagged" || link.type === "in_area") {
         return "rgba(169,125,58,0.16)";
       }
+      if (link.type === "covers") {
+        return "rgba(47,111,122,0.45)"; // teal — digest → ruling
+      }
       return "rgba(80,90,110,0.22)";
     },
     [activeId],

web-ui/src/components/graph/graph-filter-panel.tsx

@@ -44,6 +44,7 @@ export type GraphControls = {
   showPracticeAreas: boolean;
   showHalachot: boolean;
   showGaps: boolean;
+  showDigests: boolean;
 };
 
 const ALL = "__all__";
@@ -265,6 +266,11 @@ export function GraphFilterPanel({
             checked={controls.showGaps}
             onCheckedChange={(v) => onChange({ showGaps: v })}
           />
+          <ToggleRow
+            label="יומונים (כל יום)"
+            checked={controls.showDigests}
+            onCheckedChange={(v) => onChange({ showDigests: v })}
+          />
           <ToggleRow
             label="הלכות (שלב ב׳)"
             checked={controls.showHalachot}

web-ui/src/components/graph/graph-node-panel.tsx

@@ -20,6 +20,7 @@ const TYPE_LABELS: Record<string, string> = {
   topic: "נושא",
   practice_area: "תחום",
   gap: "פסיקה חסרה",
+  digest: "יומון",
 };
 
 const GAP_STATUS_LABELS: Record<string, string> = {
@@ -52,6 +53,7 @@ export function GraphNodePanel({
 }) {
   const isPrecedentLike = node.type === "precedent" || node.type === "halacha";
   const isGap = node.type === "gap";
+  const isDigest = node.type === "digest";
   return (
     <Card className="bg-surface border-rule shadow-sm w-80 shrink-0 overflow-y-auto">
       <CardContent className="space-y-4 p-4">
@@ -98,7 +100,19 @@ export function GraphNodePanel({
               </p>
             </>
           )}
-          {!isPrecedentLike && !isGap && (
+          {isDigest && (
+            <>
+              {node.note && (
+                <p className="text-ink text-sm leading-relaxed m-0">{node.note}</p>
+              )}
+              {node.court && <Row label="ערכאה" value={node.court} />}
+              {node.date && <Row label="תאריך" value={node.date.slice(0, 10)} />}
+              <p className="text-ink-muted text-xs leading-relaxed m-0">
+                סיכום יומי מ״כל יום״ — מצביע על הפסיקה שהוא מנתח.
+              </p>
+            </>
+          )}
+          {!isPrecedentLike && !isGap && !isDigest && (
             <p className="text-ink-muted text-xs leading-relaxed m-0">
               לחיצה על נקודה זו מתמקדת בשכניה — כל הפסיקות המשויכות אליה.
             </p>
@@ -122,6 +136,15 @@ export function GraphNodePanel({
             </Link>
           </Button>
         )}
+
+        {isDigest && (
+          <Button asChild variant="outline" className="w-full">
+            <Link href="/digests">
+              <ExternalLink className="size-4 me-2" />
+              לעמוד היומונים
+            </Link>
+          </Button>
+        )}
       </CardContent>
     </Card>
   );

web-ui/src/components/graph/graph-view.tsx

@@ -66,6 +66,7 @@ export function GraphView() {
     showPracticeAreas: true,
     showHalachot: false,
     showGaps: false,
+    showDigests: false,
   });
   const facets = useGraphFacets().data;
   const [selectedNode, setSelectedNode] = useState<GraphNode | null>(null);
@@ -80,12 +81,14 @@ export function GraphView() {
     if (controls.showPracticeAreas) t.push("practice_area");
     if (controls.showHalachot) t.push("halacha");
     if (controls.showGaps) t.push("gap");
+    if (controls.showDigests) t.push("digest");
     return t.join(",");
   }, [
     controls.showTopics,
     controls.showPracticeAreas,
     controls.showHalachot,
     controls.showGaps,
+    controls.showDigests,
   ]);
 
   // Metrics are needed when colouring by cluster or sizing by a centrality.

web-ui/src/lib/api/graph.ts

@@ -19,7 +19,8 @@ export type GraphNodeType =
   | "halacha"
   | "topic"
   | "practice_area"
-  | "gap";
+  | "gap"
+  | "digest";
 
 export type GraphEdgeType =
   | "cites"
@@ -27,7 +28,8 @@ export type GraphEdgeType =
   | "tagged"
   | "in_area"
   | "corroborates"
-  | "equivalent";
+  | "equivalent"
+  | "covers";
 
 export type GraphNode = {
   id: string;
@@ -45,6 +47,8 @@ export type GraphNode = {
   community: number | null; // dense cluster id, 0 = largest
   gap_status: string | null; // gap nodes only — open|uploaded|closed|irrelevant
   missing_precedent_id: string | null; // gap nodes only
+  note: string | null; // digest nodes only — the holding line
+  digest_id: string | null; // digest nodes only
 };
 
 export type GraphFacets = {