Rename smartrun to geniusrun throughout the codebase

Updates the Go module path, cmd/smartrund -> cmd/geniusrund, the
smartrun-dev skill, .gitignore, and every reference in docs/CLAUDE.md
to match.

backend/cmd/geniusrund/main.go

@@ -1,4 +1,4 @@
-// Command smartrund is smartrun's backend server: syncs runs from Garmin,
+// Command geniusrund is geniusrun's backend server: syncs runs from Garmin,
 // classifies them into workout kinds, and serves the REST API the frontend
 // talks to.
 package main
@@ -11,11 +11,11 @@ import (
 	"syscall"
 	"time"
 
-	"smartrun/backend/internal/api"
-	"smartrun/backend/internal/config"
-	"smartrun/backend/internal/garmin"
-	"smartrun/backend/internal/store"
-	appsync "smartrun/backend/internal/sync"
+	"geniusrun/backend/internal/api"
+	"geniusrun/backend/internal/config"
+	"geniusrun/backend/internal/garmin"
+	"geniusrun/backend/internal/store"
+	appsync "geniusrun/backend/internal/sync"
 )
 
 func main() {
@@ -57,7 +57,7 @@ func main() {
 
 	httpServer := &http.Server{Addr: cfg.Addr, Handler: server.Router()}
 	go func() {
-		log.Printf("smartrund listening on %s", cfg.Addr)
+		log.Printf("geniusrund listening on %s", cfg.Addr)
 		if err := httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
 			log.Fatalf("http server: %v", err)
 		}

backend/cmd/seedsample/main.go

@@ -12,14 +12,14 @@ import (
 	"log"
 	"time"
 
-	"smartrun/backend/internal/classify"
-	"smartrun/backend/internal/garmin/mock"
-	"smartrun/backend/internal/store"
-	appsync "smartrun/backend/internal/sync"
+	"geniusrun/backend/internal/classify"
+	"geniusrun/backend/internal/garmin/mock"
+	"geniusrun/backend/internal/store"
+	appsync "geniusrun/backend/internal/sync"
 )
 
 func main() {
-	dbPath := flag.String("db", "smartrun_sample.db", "path to the SQLite database to seed")
+	dbPath := flag.String("db", "geniusrun_sample.db", "path to the SQLite database to seed")
 	flag.Parse()
 
 	ctx := context.Background()