Merge polecat/Nux: exclude pinned from bd blocked

internal/storage/sqlite/schema.go

@@ -34,6 +34,8 @@ CREATE TABLE IF NOT EXISTS issues (
     pinned INTEGER DEFAULT 0,
     -- NOTE: replies_to, relates_to, duplicate_of, superseded_by removed per Decision 004
     -- These relationships are now stored in the dependencies table
+    -- Workflow fields
+    pinned INTEGER DEFAULT 0,
     CHECK ((status = 'closed') = (closed_at IS NOT NULL))
 );