feat(rc): add --force guard for legacy homesickrc

internal/homesick/cli/cli.go

@@ -191,6 +191,7 @@ type execAllCmd struct {
 }
 
 type rcCmd struct {
+	Force  bool   `help:"Bypass legacy .homesickrc safety confirmation."`
 	Castle string `arg:"" optional:"" name:"CASTLE" help:"Castle name."`
 }
 
@@ -216,7 +217,13 @@ func (c *cdCmd) Run(app *core.App) error       { return app.ShowPath(defaultCast
 func (c *openCmd) Run(app *core.App) error    { return app.Open(defaultCastle(c.Castle)) }
 func (c *execCmd) Run(app *core.App) error    { return app.Exec(c.Castle, c.Command) }
 func (c *execAllCmd) Run(app *core.App) error { return app.ExecAll(c.Command) }
-func (c *rcCmd) Run(app *core.App) error       { return app.Rc(defaultCastle(c.Castle)) }
+func (c *rcCmd) Run(app *core.App) error {
+	originalForce := app.Force
+	app.Force = c.Force
+	err := app.Rc(defaultCastle(c.Castle))
+	app.Force = originalForce
+	return err
+}
 func (c *generateCmd) Run(app *core.App) error { return app.Generate(c.Path) }
 
 func defaultCastle(castle string) string {

internal/homesick/core/core.go

@@ -780,6 +780,10 @@ func (a *App) Rc(castle string) error {
 	homesickD := filepath.Join(castleRoot, ".homesick.d")
 	homesickRc := filepath.Join(castleRoot, ".homesickrc")
 
+	if _, err := os.Stat(homesickRc); err == nil && !a.Force {
+		return errors.New("refusing to run legacy .homesickrc without --force")
+	}
+
 	// If .homesickrc exists, ensure .homesick.d/parity.rb wrapper is created
 	// (but do not overwrite an existing parity.rb).
 	if _, err := os.Stat(homesickRc); err == nil {

internal/homesick/core/rc_test.go

@@ -130,6 +130,7 @@ func (s *RcSuite) TestRc_HomesickrcCreatesRubyWrapper() {
 	castleRoot := s.createCastle("dotfiles")
 	homesickRc := filepath.Join(castleRoot, ".homesickrc")
 	require.NoError(s.T(), os.WriteFile(homesickRc, []byte("# ruby setup code\n"), 0o644))
+	s.app.Force = true
 
 	require.NoError(s.T(), s.app.Rc("dotfiles"))
 
@@ -151,6 +152,7 @@ func (s *RcSuite) TestRc_HomesickrcWrapperNotOverwrittenIfExists() {
 	castleRoot := s.createCastle("dotfiles")
 	homesickRc := filepath.Join(castleRoot, ".homesickrc")
 	require.NoError(s.T(), os.WriteFile(homesickRc, []byte("# ruby setup code\n"), 0o644))
+	s.app.Force = true
 
 	homesickD := filepath.Join(castleRoot, ".homesick.d")
 	require.NoError(s.T(), os.MkdirAll(homesickD, 0o755))
@@ -171,6 +173,7 @@ func (s *RcSuite) TestRc_HomesickrcWrapperCreatedBeforeExecution() {
 	castleRoot := s.createCastle("dotfiles")
 	homesickRc := filepath.Join(castleRoot, ".homesickrc")
 	require.NoError(s.T(), os.WriteFile(homesickRc, []byte("# ruby setup code\n"), 0o644))
+	s.app.Force = true
 
 	homesickD := filepath.Join(castleRoot, ".homesick.d")
 	require.NoError(s.T(), os.MkdirAll(homesickD, 0o755))