Some bug fixes:

- logging: LogToFile shadowed the package-level fileLogger, so
  IsFileLogger was always false and Shutdown never closed the file
- logging: replace IsJSONHandler's unsafe reflection into slog
  internals with a *slog.JSONHandler type check
- cli: fail if the log file can't be opened instead of silently
  logging to the terminal; return the log shutdown error from Finish
- build.sh: -X flags used the wrong module path, so the version, build
  time and commit were never stamped

internal/config/section_test.go

@@ -19,14 +19,14 @@ type testEmbedded struct {
 
 type testSection struct {
 	testEmbedded
-	Str      string        `cfg:"str" default:"hello"`
-	Int      int           `cfg:"int" default:"-42"`
+	Str      string        `cfg:"str"        default:"hello"`
+	Int      int           `cfg:"int"        default:"-42"`
 	Int8     int8          `cfg:"int8"`
-	Uint     uint          `cfg:"uint" default:"7"`
+	Uint     uint          `cfg:"uint"       default:"7"`
 	Uint16   uint16        `cfg:"uint16"`
-	Float    float64       `cfg:"float" default:"1.5"`
+	Float    float64       `cfg:"float"      default:"1.5"`
 	Float32  float32       `cfg:"float32"`
-	Dur      time.Duration `cfg:"dur" default:"90s"`
+	Dur      time.Duration `cfg:"dur"        default:"90s"`
 	When     time.Time     `cfg:"when"`
 	Slice    []string      `cfg:"slice"`
 	Inner    testInner     `cfg:"inner"`