refactor: move toolchain from root to pkg/toolchain (#2041)

Move the toolchain package from the repository root to pkg/toolchain to align with project architecture guidelines. All business logic belongs in pkg/ - no packages should exist at the repo root level.

Changes:
- Move 94 Go files from toolchain/ to pkg/toolchain/ (preserves git history)
- Update 90 import statements across 145 files to reference github.com/cloudposse/atmos/pkg/toolchain
- Regenerate mocks with updated import paths
- Update documentation references

This ensures consistency with other business logic packages (config, stack, component, store, git, auth, etc.).

Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>
Co-authored-by: Andriy Knysh <aknysh@users.noreply.github.com>

Author: 3 people

cmd/root.go

@@ -65,7 +65,7 @@ import (
 	_ "github.com/cloudposse/atmos/cmd/vendor"
 	"github.com/cloudposse/atmos/cmd/version"
 	_ "github.com/cloudposse/atmos/cmd/workflow"
-	"github.com/cloudposse/atmos/toolchain"
+	"github.com/cloudposse/atmos/pkg/toolchain"
 )
 
 const (

cmd/toolchain/add.go

@@ -8,7 +8,7 @@ import (
 	errUtils "github.com/cloudposse/atmos/errors"
 	"github.com/cloudposse/atmos/pkg/flags"
 	"github.com/cloudposse/atmos/pkg/flags/compat"
-	"github.com/cloudposse/atmos/toolchain"
+	"github.com/cloudposse/atmos/pkg/toolchain"
 )
 
 var addCmd = &cobra.Command{

cmd/toolchain/add_test.go

@@ -11,7 +11,7 @@ import (
 
 	errUtils "github.com/cloudposse/atmos/errors"
 	"github.com/cloudposse/atmos/pkg/schema"
-	"github.com/cloudposse/atmos/toolchain"
+	"github.com/cloudposse/atmos/pkg/toolchain"
 )
 
 // TestAddCommand_Structure tests the add command structure.

cmd/toolchain/clean.go

@@ -10,8 +10,8 @@ import (
 	"github.com/cloudposse/atmos/pkg/config/homedir"
 	"github.com/cloudposse/atmos/pkg/flags"
 	"github.com/cloudposse/atmos/pkg/flags/compat"
+	"github.com/cloudposse/atmos/pkg/toolchain"
 	"github.com/cloudposse/atmos/pkg/xdg"
-	"github.com/cloudposse/atmos/toolchain"
 )
 
 var cleanCmd = &cobra.Command{

cmd/toolchain/du.go

@@ -6,7 +6,7 @@ import (
 	"github.com/cloudposse/atmos/cmd/internal"
 	"github.com/cloudposse/atmos/pkg/flags"
 	"github.com/cloudposse/atmos/pkg/flags/compat"
-	"github.com/cloudposse/atmos/toolchain"
+	"github.com/cloudposse/atmos/pkg/toolchain"
 )
 
 var duCmd = &cobra.Command{

cmd/toolchain/env.go

@@ -11,7 +11,7 @@ import (
 	errUtils "github.com/cloudposse/atmos/errors"
 	"github.com/cloudposse/atmos/pkg/flags"
 	"github.com/cloudposse/atmos/pkg/flags/compat"
-	"github.com/cloudposse/atmos/toolchain"
+	"github.com/cloudposse/atmos/pkg/toolchain"
 )
 
 var supportedFormats = []string{"bash", "json", "dotenv", "fish", "powershell", "github"}

cmd/toolchain/env_test.go

@@ -13,7 +13,7 @@ import (
 
 	errUtils "github.com/cloudposse/atmos/errors"
 	"github.com/cloudposse/atmos/pkg/schema"
-	"github.com/cloudposse/atmos/toolchain"
+	"github.com/cloudposse/atmos/pkg/toolchain"
 )
 
 func TestEnvCommandProvider(t *testing.T) {

cmd/toolchain/exec.go

@@ -9,7 +9,7 @@ import (
 	errUtils "github.com/cloudposse/atmos/errors"
 	"github.com/cloudposse/atmos/pkg/flags"
 	"github.com/cloudposse/atmos/pkg/flags/compat"
-	"github.com/cloudposse/atmos/toolchain"
+	"github.com/cloudposse/atmos/pkg/toolchain"
 )
 
 var execCmd = &cobra.Command{

cmd/toolchain/get.go

@@ -6,7 +6,7 @@ import (
 
 	"github.com/cloudposse/atmos/pkg/flags"
 	"github.com/cloudposse/atmos/pkg/flags/compat"
-	"github.com/cloudposse/atmos/toolchain"
+	"github.com/cloudposse/atmos/pkg/toolchain"
 )
 
 const (

cmd/toolchain/info.go

@@ -6,7 +6,7 @@ import (
 
 	"github.com/cloudposse/atmos/pkg/flags"
 	"github.com/cloudposse/atmos/pkg/flags/compat"
-	"github.com/cloudposse/atmos/toolchain"
+	"github.com/cloudposse/atmos/pkg/toolchain"
 )
 
 var infoParser *flags.StandardParser