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/Controller/PatternPerformance.hs

@@ -0,0 +1,66 @@
+module Web.Controller.PatternPerformance where
+
+-- IHF Phase 12 — Platform Memory (IHUB-WP-0013 T03)
+
+import Web.Controller.Prelude
+import Web.View.PatternPerformance.Index
+import IHP.ModelSupport (sqlQuery)
+
+instance Controller PatternPerformanceController where
+    beforeAction = ensureIsUser
+
+    action PatternPerformanceAction = do
+        records <- query @PatternPerformanceRecord
+            |> orderByAsc #outcomeRank
+            |> fetch
+        hubs    <- query @Hub |> orderByAsc #name |> fetch
+        render IndexView { records, hubs }
+
+    action ComputePatternPerformanceAction { hubIdForPerformance } = do
+        let hubId = hubIdForPerformance
+        rows <- sqlQuery
+            "SELECT \
+            \    wp.id AS pattern_id, \
+            \    COUNT(DISTINCT pa.id)::int AS adoption_count, \
+            \    COUNT(os.id)::int AS total_outcome_count, \
+            \    COUNT(os.id) FILTER ( \
+            \        WHERE os.signal_type IN ('success','adoption','satisfaction') \
+            \    )::int AS positive_outcome_count, \
+            \    AVG(os.value) AS mean_outcome_value \
+            \ FROM widget_patterns wp \
+            \ JOIN pattern_adoptions pa ON pa.widget_pattern_id = wp.id \
+            \ JOIN widgets w ON w.hub_id = pa.adopting_hub_id \
+            \     AND w.widget_type = wp.widget_type \
+            \ JOIN deployment_records dep ON dep.id IN ( \
+            \     SELECT dep2.id FROM deployment_records dep2 \
+            \     JOIN decision_records dr2 ON dr2.id = dep2.decision_id \
+            \     JOIN requirements r2 ON r2.id = dr2.requirement_id \
+            \     JOIN requirement_candidates rc2 ON rc2.id = r2.candidate_id \
+            \     WHERE rc2.source_widget_id = w.id \
+            \ ) \
+            \ JOIN outcome_signals os ON os.deployment_id = dep.id \
+            \ WHERE pa.adopting_hub_id = ? \
+            \ GROUP BY wp.id"
+            [hubId]
+            :: IO [(Id WidgetPattern, Int, Int, Int, Maybe Double)]
+
+        now <- getCurrentTime
+        -- Delete existing records for this hub then insert fresh
+        deleteWhere @PatternPerformanceRecord (#hubId, hubId)
+        -- Insert with rank computation
+        let sorted = sortBy (\(_, _, _, pos1, _) (_, _, _, pos2, _) -> compare pos2 pos1) rows
+            ranked = zip [1..] sorted
+        forM_ ranked \(rank, (patId, adoptions, total, positive, meanVal)) ->
+            newRecord @PatternPerformanceRecord
+                |> set #widgetPatternId patId
+                |> set #hubId hubId
+                |> set #adoptionCount adoptions
+                |> set #positiveOutcomeCount positive
+                |> set #totalOutcomeCount total
+                |> set #meanOutcomeValue meanVal
+                |> set #outcomeRank (Just rank)
+                |> set #calibratedAt now
+                |> createRecord
+
+        setSuccessMessage ("Pattern performance computed: " <> show (length rows) <> " patterns")
+        redirectTo PatternPerformanceAction