refactor: consolidate cache and state into .local/hexai directory

Move all cache and state files under ~/.local/hexai/ with subdirectories:
- ~/.local/hexai/cache/    (was ~/.cache/hexai/)
- ~/.local/hexai/state/    (was ~/.local/state/hexai/)
- ~/.local/hexai/data/     (was ~/.local/share/hexai/)

This centralizes all non-config hexai files under a single .local/hexai directory,
making it easier to manage and back up user data.

Amp-Thread-ID: https://ampcode.com/threads/T-019c4e03-73db-70a2-ae27-3e1cc31d59c3
Co-authored-by: Amp <amp@ampcode.com>

2 files changed, 4 insertions, 4 deletions

diff --git a/internal/hexaimcp/run.go b/internal/hexaimcp/run.go
index 448d826..6b28a2a 100644
--- a/internal/hexaimcp/run.go
+++ b/internal/hexaimcp/run.go
@@ -131,17 +131,17 @@ func getPromptsDir(cfg appconfig.App) (string, error) {
 		return expandPath(cfgDir)
 	}
 
-	// Default: $XDG_DATA_HOME/hexai/prompts/ or ~/.local/share/hexai/prompts/
+	// Default: $XDG_DATA_HOME/prompts/ or ~/.local/hexai/data/prompts/
 	dataDir := os.Getenv("XDG_DATA_HOME")
 	if dataDir == "" {
 		home, err := os.UserHomeDir()
 		if err != nil {
 			return "", fmt.Errorf("cannot find user home directory: %w", err)
 		}
-		dataDir = filepath.Join(home, ".local", "share")
+		dataDir = filepath.Join(home, ".local", "hexai", "data")
 	}
 
-	return filepath.Join(dataDir, "hexai", "prompts"), nil
+	return filepath.Join(dataDir, "prompts"), nil
 }
 
 // expandPath expands ~ to home directory and returns absolute path.
diff --git a/internal/hexaimcp/run_test.go b/internal/hexaimcp/run_test.go
index 981a05f..2adf678 100644
--- a/internal/hexaimcp/run_test.go
+++ b/internal/hexaimcp/run_test.go
@@ -114,7 +114,7 @@ func TestGetPromptsDir(t *testing.T) {
 			name:      "uses default XDG location",
 			envVar:    "",
 			cfgValue:  "",
-			wantMatch: "hexai/prompts",
+			wantMatch: ".local/hexai/data/prompts",
 		},
 	}