feat(WP-0013): IHF Phase 12 — Platform Memory and Continuous Learning

Closes the long-range feedback loop: outcome signals now enrich the full
traceability chain and feed back into routing, triage, and AI proposals.

Schema (T01):
- outcome_correlations (CHECK correlation_type)
- pattern_performance_records
- adaptive_threshold_configs
- institutional_knowledge_entries (GIN tsvector FTS)
- learning_insights (CHECK insight_type)
- ALTER TABLE decision_records + requirement_candidates: outcome_summary JSONB
- AFTER INSERT trigger trg_enrich_lineage on outcome_signals
- contracts/core/ updated (outcome-summary-columns-v1, append-only addendum)

Correlation engine (T02):
- Application/Helper/CorrelationEngine.hs: pure annotation→outcome SQL
- Web/Controller/OutcomeCorrelations.hs: ComputeCorrelationsAction + index

Pattern performance (T03):
- Web/Controller/PatternPerformance.hs: ComputePatternPerformanceAction

Adaptive thresholds (T04):
- Web/Controller/AdaptiveThresholds.hs: CalibrateThresholdsAction
- Application/Helper/FrictionScore.hs: applyAdaptiveWeights

Institutional knowledge (T05):
- DistilDecisionAction in DecisionRecords controller
- Web/Controller/InstitutionalKnowledge.hs: QueryKnowledgeBaseAction

Lineage enrichment (T06):
- Web/Controller/LineageEnrichment.hs: EnrichLineageAction (batch backfill)
- enrich_lineage_on_outcome_batch() PL/pgSQL helper in migration

Learning dashboard (T07):
- Web/Controller/LearningDashboard.hs: 5-panel autoRefresh view
- "Learning" nav link in FrontController

API v2 learning endpoints (T08):
- GET /api/v2/outcome-correlations, /pattern-performance, /knowledge-base/{id}
- OpenAPI schemas: OutcomeCorrelation, PatternPerformanceRecord, InstitutionalKnowledgeEntry

GAAF scorecard + docs (T09):
- Core 3.8→3.9, Functional 3.6→3.8, overall 3.61→3.68
- CLAUDE.md: IHF v0.2 complete, no active workplan

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

Web/View/PatternPerformance/Index.hs

@@ -0,0 +1,64 @@
+module Web.View.PatternPerformance.Index where
+
+import Web.View.Prelude
+
+data IndexView = IndexView
+    { records :: ![PatternPerformanceRecord]
+    , hubs    :: ![Hub]
+    }
+
+instance View IndexView where
+    html IndexView { .. } = [hsx|
+        <div class="p-6">
+            <div class="flex justify-between items-center mb-6">
+                <h1 class="text-2xl font-bold text-gray-900">Pattern Performance</h1>
+            </div>
+            <div class="mb-4 flex gap-2 flex-wrap">
+                {forM_ hubs \h -> [hsx|
+                    <form method="POST" action={ComputePatternPerformanceAction { hubIdForPerformance = h.id }} class="inline">
+                        {csrfTokenTag}
+                        <button type="submit"
+                            class="px-3 py-1.5 text-sm bg-indigo-600 text-white rounded hover:bg-indigo-700">
+                            Recompute for {h.name}
+                        </button>
+                    </form>
+                |]}
+            </div>
+            <div class="bg-white shadow rounded-lg overflow-hidden">
+                <table class="min-w-full divide-y divide-gray-200">
+                    <thead class="bg-gray-50">
+                        <tr>
+                            <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase">Rank</th>
+                            <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase">Pattern</th>
+                            <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase">Adoptions</th>
+                            <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase">Positive / Total</th>
+                            <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase">Positive Rate</th>
+                            <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase">Mean Value</th>
+                        </tr>
+                    </thead>
+                    <tbody class="divide-y divide-gray-200">
+                        {forM_ records renderRow}
+                    </tbody>
+                </table>
+            </div>
+        </div>
+    |]
+      where
+        renderRow r =
+            let rate = if r.totalOutcomeCount > 0
+                        then fromIntegral r.positiveOutcomeCount / fromIntegral r.totalOutcomeCount :: Double
+                        else 0.0
+                rankLabel = maybe "-" show r.outcomeRank
+            in [hsx|
+            <tr>
+                <td class="px-6 py-4 text-sm text-gray-500">{rankLabel}</td>
+                <td class="px-6 py-4 text-sm font-medium text-gray-900">
+                    <a href={ShowWidgetPatternAction { widgetPatternId = r.widgetPatternId }}
+                       class="text-blue-600 hover:underline">{show r.widgetPatternId}</a>
+                </td>
+                <td class="px-6 py-4 text-sm text-gray-500">{show r.adoptionCount}</td>
+                <td class="px-6 py-4 text-sm text-gray-500">{show r.positiveOutcomeCount}/{show r.totalOutcomeCount}</td>
+                <td class="px-6 py-4 text-sm text-gray-500">{show (round (rate * 100) :: Int)}%</td>
+                <td class="px-6 py-4 text-sm text-gray-500">{maybe "-" show r.meanOutcomeValue}</td>
+            </tr>
+        |]