Adapt upstream category-based code to v2 tag taxonomy

Upstream's new OG routes, eval layout, and benchmark-detail additions
referenced the retired v1 category model. Map to v2 equivalents:
- evaluations_by_category -> evaluations_by_tag (OG model card)
- summary.category -> derived_tags[0] (OG/eval-detail social subtitle)
- category: CategoryType -> EvalTag (benchmark-detail local row types)
- summary_eval_ids -> constituent_evaluation_ids (clean-hierarchy Vals.ai merge)

Also cast a pre-existing parseMaybeJson(evalcards_annotations) to
RowAnnotations in view-data (latent, masked by ignoreBuildErrors).

app/api/og/evals/[...id]/route.tsx

@@ -42,7 +42,7 @@ export async function GET(
         summary.evaluation_name ??
         summary.composite_display_name ??
         evalName
-      category = summary.category ?? null
+      category = summary.derived_tags?.[0] ?? null
       modelsCount = summary.models_count ?? null
       topModelName = summary.best_model?.name ?? null
       topScore = summary.best_model?.score ?? null

app/api/og/models/[...id]/route.tsx

@@ -30,7 +30,7 @@ export async function GET(
     if (summary) {
       modelName = summary.model_info?.name ?? modelName
       developer = summary.model_info?.developer ?? null
-      const categories = summary.evaluations_by_category ?? {}
+      const categories = summary.evaluations_by_tag ?? {}
       const seen = new Set<string>()
       let total = 0
       for (const items of Object.values(categories)) {

app/evals/[...id]/layout.tsx

@@ -27,7 +27,7 @@ export async function generateMetadata(props: {
         summary.evaluation_name ??
         summary.composite_display_name ??
         evalName
-      category = summary.category ?? null
+      category = summary.derived_tags?.[0] ?? null
       modelsCount = summary.models_count ?? null
     }
   } catch {

components/benchmark-detail.tsx

@@ -8307,7 +8307,7 @@ function SummaryMetricsList({
     rankTotal: number | null
     rankRatio: number | null
     evalSummaryId: string | null
-    category: CategoryType
+    category: EvalTag
   }
   type Bucket = { key: string; name: string; rows: Row[] }
   const buckets = new Map<string, Bucket>()
@@ -8439,7 +8439,7 @@ type SummaryRow = {
   rankTotal: number | null
   rankRatio: number | null
   evalSummaryId: string | null
-  category: CategoryType
+  category: EvalTag
 }
 
 function SummaryBucketBlock({

lib/clean-hierarchy.ts

@@ -1077,7 +1077,7 @@ function collapseValsAiSetupVariants(h: CleanableHierarchy) {
       if (!canonical) continue
 
       const existingSliceKeys = new Set((canonical.slices ?? []).map((s) => s.key))
-      const mergedEvalIds = new Set(canonical.summary_eval_ids ?? [])
+      const mergedEvalIds = new Set(canonical.constituent_evaluation_ids ?? [])
 
       for (const l of leaked) {
         const m = l.key.match(PATTERN)
@@ -1096,10 +1096,10 @@ function collapseValsAiSetupVariants(h: CleanableHierarchy) {
           })
           existingSliceKeys.add(sliceKey)
         }
-        for (const id of l.summary_eval_ids ?? []) mergedEvalIds.add(id)
+        for (const id of l.constituent_evaluation_ids ?? []) mergedEvalIds.add(id)
         removeKeys.add(l.key)
       }
-      canonical.summary_eval_ids = Array.from(mergedEvalIds)
+      canonical.constituent_evaluation_ids = Array.from(mergedEvalIds)
     }
 
     if (removeKeys.size > 0) {

lib/view-data.ts

@@ -18,7 +18,7 @@ import {
   type SourceData,
   type SourceMetadata,
 } from "@/lib/benchmark-schema"
-import type { DeveloperListEntry } from "@/lib/backend-artifacts"
+import type { DeveloperListEntry, RowAnnotations } from "@/lib/backend-artifacts"
 import type {
   BenchmarkEvalListItem,
   BenchmarkEvalSummary,
@@ -390,7 +390,7 @@ function resultFromCell(row: Row): EvaluationResult {
   // it passes through unchanged when the value is already an object
   // (legacy snapshots / future binding fixes).
   const generationConfig = parseMaybeJson(row.generation_config) as GenerationConfig | undefined
-  const annotations = parseMaybeJson(row.evalcards_annotations)
+  const annotations = parseMaybeJson(row.evalcards_annotations) as RowAnnotations | undefined
 
   return {
     evaluation_name: asString(row.metric_display_name ?? row.eval_evaluation_name ?? row.metric_id, "Score"),