Add chunk plan cache configuration and storage

internal/core/config/file_config.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"fmt"
 	"os"
+	"path/filepath"
 	"sort"
 	"strings"
 
@@ -54,11 +55,17 @@ type FileDiagnosticsConfig struct {
 
 type FileWorkspaceConfig struct {
 	Directory   *string                         `yaml:"directory,omitempty"`
+	ChunkCache  *FileWorkspaceChunkCacheConfig  `yaml:"chunk_cache,omitempty"`
 	Diagnostics *FileWorkspaceDiagnosticsConfig `yaml:"diagnostics,omitempty"`
 	Resume      *FileWorkspaceEnabledConfig     `yaml:"resume,omitempty"`
 	Debug       *FileWorkspaceEnabledConfig     `yaml:"debug,omitempty"`
 }
 
+type FileWorkspaceChunkCacheConfig struct {
+	Mode      *string `yaml:"mode,omitempty"`
+	Directory *string `yaml:"directory,omitempty"`
+}
+
 type FileWorkspaceDiagnosticsConfig struct {
 	Enabled   *bool   `yaml:"enabled,omitempty"`
 	Retention *string `yaml:"retention,omitempty"`
@@ -338,6 +345,18 @@ func (c *Config) applyFileConfigWithLookup(fileCfg FileConfig, lookup func(strin
 		if fileCfg.Workspace.Directory != nil {
 			c.Workspace.Directory = strings.TrimSpace(*fileCfg.Workspace.Directory)
 		}
+		if fileCfg.Workspace.ChunkCache != nil {
+			if fileCfg.Workspace.ChunkCache.Mode != nil {
+				mode, err := pipeline.ParseChunkCacheMode(*fileCfg.Workspace.ChunkCache.Mode)
+				if err != nil {
+					return fmt.Errorf("workspace.chunk_cache.mode: %w", err)
+				}
+				c.Workspace.ChunkCache.Mode = mode
+			}
+			if fileCfg.Workspace.ChunkCache.Directory != nil {
+				c.Workspace.ChunkCache.Directory = cleanOptionalPath(*fileCfg.Workspace.ChunkCache.Directory)
+			}
+		}
 		if fileCfg.Workspace.Diagnostics != nil {
 			if fileCfg.Workspace.Diagnostics.Enabled != nil {
 				c.Workspace.Diagnostics.Enabled = *fileCfg.Workspace.Diagnostics.Enabled
@@ -360,6 +379,14 @@ func (c *Config) applyFileConfigWithLookup(fileCfg FileConfig, lookup func(strin
 	return nil
 }
 
+func cleanOptionalPath(value string) string {
+	value = strings.TrimSpace(value)
+	if value == "" {
+		return ""
+	}
+	return filepath.Clean(value)
+}
+
 func normalizeStageWorkers(values map[string]int) (map[string]int, bool, error) {
 	workers := make(map[string]int, len(values))
 	configured := false