fix: code review fixes from gt-2tp and gt-y0t

- Replace custom contains() with strings.Contains in init.go
- Make session stop --force flag actually work
- Update session.Manager.Stop() to accept force parameter

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/cmd/init.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"github.com/spf13/cobra"
 	"github.com/steveyegge/gastown/internal/git"
@@ -106,8 +107,7 @@ func updateGitExclude(repoPath string) error {
 	}
 
 	// Check if already has Gas Town section
-	contentStr := string(content)
-	if len(content) > 0 && contains(contentStr, "Gas Town") {
+	if strings.Contains(string(content), "Gas Town") {
 		return nil // Already configured
 	}
 
@@ -126,16 +126,3 @@ func updateGitExclude(repoPath string) error {
 	// Write back
 	return os.WriteFile(excludePath, append(content, []byte(additions)...), 0644)
 }
-
-func contains(s, substr string) bool {
-	return len(s) >= len(substr) && (s == substr || len(s) > 0 && containsHelper(s, substr))
-}
-
-func containsHelper(s, substr string) bool {
-	for i := 0; i <= len(s)-len(substr); i++ {
-		if s[i:i+len(substr)] == substr {
-			return true
-		}
-	}
-	return false
-}

internal/cmd/session.go

@@ -225,8 +225,12 @@ func runSessionStop(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	fmt.Printf("Stopping session for %s/%s...\n", rigName, polecatName)
-	if err := mgr.Stop(polecatName); err != nil {
+	if sessionForce {
+		fmt.Printf("Force stopping session for %s/%s...\n", rigName, polecatName)
+	} else {
+		fmt.Printf("Stopping session for %s/%s...\n", rigName, polecatName)
+	}
+	if err := mgr.Stop(polecatName, sessionForce); err != nil {
 		return fmt.Errorf("stopping session: %w", err)
 	}