refactor(config): use ~/.config/lune as config dir

Amolith created

Assisted-by: Claude Sonnet 4 via Crush

Change summary

AGENTS.md                 | 2 +-
internal/config/config.go | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

Detailed changes

AGENTS.md 🔗

@@ -45,7 +45,7 @@ cmd/
   habit/             → habit track
 internal/
   client/            → Lunatask API client factory (uses system keyring)
-  config/            → TOML config at ~/.config/lunatask/config.toml
+  config/            → TOML config at ~/.config/lune/config.toml
   ui/                → Lipgloss styles (Success, Warning, Error, Muted, Bold)
   validate/          → Input validation (UUID format)
 ```

internal/config/config.go 🔗

@@ -73,7 +73,7 @@ func Path() (string, error) {
 		return "", fmt.Errorf("getting config dir: %w", err)
 	}
 
-	return filepath.Join(configDir, "lunatask", "config.toml"), nil
+	return filepath.Join(configDir, "lune", "config.toml"), nil
 }
 
 // Load reads the config file. Returns ErrNotFound if the file doesn't exist.