feat(P2+P3): IHF Phase 2 complete; register Phase 3 workplan

Phase 2 — Structured Feedback and Triage (IHUB-WP-0002):
- Schema: annotation_threads, requirement_candidates, triage_states,
  reviewer_assignments; annotations extended with severity + thread_id
- AnnotationThreadsController: create threads, assign annotations
- RequirementCandidatesController: CRUD, escalation, triage lifecycle,
  reviewer assignment, my-queue
- Annotation severity (low/medium/high/critical) with Tailwind color cues
- TriageDashboardAction on HubsController with autoRefresh
- Integration tests (T01–T09), SCOPE.md updated, docs/phase2-summary.md

Phase 3 — Governance and Decision Linkage (IHUB-WP-0003):
- Workplan registered: 9 tasks, State Hub workstream 5f201ee3

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Web/View/AnnotationThreads/Show.hs

@@ -0,0 +1,96 @@
+module Web.View.AnnotationThreads.Show where
+
+import Web.Types
+import Generated.Types
+import IHP.Prelude
+import IHP.ViewPrelude
+
+data ShowView = ShowView
+    { widget      :: !Widget
+    , thread      :: !AnnotationThread
+    , annotations :: ![Annotation]
+    }
+
+instance View ShowView where
+    html ShowView { .. } = [hsx|
+        <div class="mb-6 flex items-center gap-2 text-sm text-gray-500">
+            <a href={ShowWidgetAction { widgetId = widget.id }} class="hover:text-gray-700">{widget.name}</a>
+            <span>/</span>
+            <a href={WidgetAnnotationThreadsAction { widgetId = widget.id }} class="hover:text-gray-700">Threads</a>
+            <span>/</span>
+            <span>{thread.title}</span>
+        </div>
+
+        <div class="max-w-2xl">
+            <div class="mb-6">
+                <h1 class="text-2xl font-semibold">{thread.title}</h1>
+                {maybe mempty (\d -> [hsx|<p class="text-sm text-gray-500 mt-1">{d}</p>|]) thread.description}
+            </div>
+
+            <div class="mb-4 flex items-center gap-3">
+                {renderSeverityBar annotations}
+                <span class="text-xs text-gray-500">{dominantCategoryBadge annotations}</span>
+            </div>
+
+            <div class="space-y-3">
+                {forEach annotations renderAnnotationCard}
+            </div>
+        </div>
+    |]
+
+renderAnnotationCard :: Annotation -> Html
+renderAnnotationCard a = [hsx|
+    <div class="bg-white rounded-lg border border-gray-200 px-4 py-3">
+        <div class="flex items-center gap-2 mb-2">
+            <span class="text-xs bg-gray-100 text-gray-600 px-2 py-0.5 rounded">{a.category}</span>
+            <span class={severityClass a.severity <> " text-xs px-2 py-0.5 rounded"}>
+                {a.severity}
+            </span>
+        </div>
+        <p class="text-sm text-gray-700">{a.body}</p>
+    </div>
+|]
+
+renderSeverityBar :: [Annotation] -> Html
+renderSeverityBar annotations =
+    let total    = length annotations
+        counts   = map (\s -> (s, length $ filter (\a -> a.severity == s) annotations))
+                       ["critical", "high", "medium", "low"]
+        nonZero  = filter (\(_, n) -> n > 0) counts
+    in if total == 0
+        then mempty
+        else [hsx|
+            <div class="flex items-center gap-1">
+                {forEach nonZero (\(s, n) -> renderBarSegment s n total)}
+            </div>
+        |]
+
+renderBarSegment :: Text -> Int -> Int -> Html
+renderBarSegment sev n total =
+    let pct = (n * 100) `div` total
+    in [hsx|
+    <div class={barColor sev <> " h-2 rounded"} style={"width: " <> show pct <> "px"} title={sev <> ": " <> show n}>
+    </div>
+|]
+
+barColor :: Text -> Text
+barColor "low"      = "bg-gray-300"
+barColor "medium"   = "bg-blue-400"
+barColor "high"     = "bg-yellow-400"
+barColor "critical" = "bg-red-500"
+barColor _          = "bg-gray-300"
+
+dominantCategoryBadge :: [Annotation] -> Text
+dominantCategoryBadge [] = ""
+dominantCategoryBadge annotations =
+    let cats  = map (.category) annotations
+        tally = map (\c -> (c, length $ filter (== c) cats)) (nub cats)
+        best  = foldl1 (\(c1, n1) (c2, n2) -> if n2 > n1 then (c2, n2) else (c1, n1)) tally
+    in fst best
+
+severityClass :: Text -> Text
+severityClass "low"      = "bg-gray-100 text-gray-500"
+severityClass "medium"   = "bg-blue-100 text-blue-700"
+severityClass "high"     = "bg-yellow-100 text-yellow-800"
+severityClass "critical" = "bg-red-100 text-red-800 font-semibold"
+severityClass _          = "bg-gray-100 text-gray-500"