Add godoc documentation to exported types and methods

Add proper godoc comments to exported items in:
- internal/globals: Appname, Version, Commit variables; Globals type; New function
- internal/log: LogLevel type; level constants; Config type; Initialize, Fatal,
  Error, Warn, Notice, Info, Debug functions and variants; TTYHandler type and
  methods; Module variable; LogOptions type

internal/log/tty_handler.go

@@ -21,14 +21,14 @@ const (
 	colorBold   = "\033[1m"
 )
 
-// TTYHandler is a custom handler for TTY output with colors
+// TTYHandler is a custom slog handler for TTY output with colors.
 type TTYHandler struct {
 	opts slog.HandlerOptions
 	mu   sync.Mutex
 	out  io.Writer
 }
 
-// NewTTYHandler creates a new TTY handler
+// NewTTYHandler creates a new TTY handler with colored output.
 func NewTTYHandler(out io.Writer, opts *slog.HandlerOptions) *TTYHandler {
 	if opts == nil {
 		opts = &slog.HandlerOptions{}
@@ -39,12 +39,12 @@ func NewTTYHandler(out io.Writer, opts *slog.HandlerOptions) *TTYHandler {
 	}
 }
 
-// Enabled reports whether the handler handles records at the given level
+// Enabled reports whether the handler handles records at the given level.
 func (h *TTYHandler) Enabled(_ context.Context, level slog.Level) bool {
 	return level >= h.opts.Level.Level()
 }
 
-// Handle writes the log record
+// Handle writes the log record to the output with color formatting.
 func (h *TTYHandler) Handle(_ context.Context, r slog.Record) error {
 	h.mu.Lock()
 	defer h.mu.Unlock()
@@ -103,12 +103,12 @@ func (h *TTYHandler) Handle(_ context.Context, r slog.Record) error {
 	return nil
 }
 
-// WithAttrs returns a new handler with the given attributes
+// WithAttrs returns a new handler with the given attributes.
 func (h *TTYHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
 	return h // Simplified for now
 }
 
-// WithGroup returns a new handler with the given group name
+// WithGroup returns a new handler with the given group name.
 func (h *TTYHandler) WithGroup(name string) slog.Handler {
 	return h // Simplified for now
 }