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/internal/garmin/client.go

@@ -1,5 +1,5 @@
 // Package garmin wraps the mcp-garmin MCP server as a narrow Go client
-// interface, so the rest of smartrun never deals with MCP/JSON-RPC directly.
+// interface, so the rest of geniusrun never deals with MCP/JSON-RPC directly.
 package garmin
 
 import (
@@ -15,7 +15,7 @@ import (
 	"github.com/mark3labs/mcp-go/mcp"
 )
 
-// Client is the interface the rest of smartrun depends on. The real
+// Client is the interface the rest of geniusrun depends on. The real
 // implementation drives mcp-garmin over stdio; internal/garmin/mock provides
 // a fake for tests and frontend-only development.
 type Client interface {
@@ -94,7 +94,7 @@ func (c *mcpClient) ensureStarted(ctx context.Context) error {
 
 	initReq := mcp.InitializeRequest{}
 	initReq.Params.ProtocolVersion = mcp.LATEST_PROTOCOL_VERSION
-	initReq.Params.ClientInfo = mcp.Implementation{Name: "smartrund", Version: "0.0.1"}
+	initReq.Params.ClientInfo = mcp.Implementation{Name: "geniusrund", Version: "0.0.1"}
 	if _, err := inner.Initialize(ctx, initReq); err != nil {
 		inner.Close()
 		return fmt.Errorf("mcp initialize handshake: %w", err)

backend/internal/garmin/mock/mock.go

@@ -5,7 +5,7 @@ package mock
 import (
 	"context"
 
-	"smartrun/backend/internal/garmin"
+	"geniusrun/backend/internal/garmin"
 )
 
 // Client is a fake garmin.Client returning data supplied by the test/caller.