refactor: remove the niedziela/missalemeum scrapers, bt, traditional_lang

The daily view now computes entirely offline (previous commit), so retire the
network path and everything that served it:

- Delete internal/tradlit (missalemeum) and the niedziela scraper from
  internal/liturgy (fetch/store/parse + fixtures); keep Section, DayInfo and
  ExtractCitation.
- Remove the "bt" version everywhere (render gatherBT + branches, config,
  i18n, web form, TUI) and bible.ToEnglishRef (Polish citation converter).
  A legacy config carrying "bt" migrates to "wuj" on load (config.migrateBT).
- Remove the traditional_lang config field and the -g/--lang flag from all
  three binaries.
- Drop the now-dead flags -R/--refresh, -o/--offline, -u/--update,
  -C/--clean and the harvest/clean commands.
- New defaults: versions = wuj,vul,grb,drb; default_version = vul.

Update the README (offline-by-design, no harvest/update), help text, and
stale niedziela/bt doc comments. Tests updated for the offline reality;
go test ./... and go vet ./... are clean, all three binaries build and run
offline (OF + EF, compare, web).

2 files changed, 6 insertions, 28 deletions

diff --git a/cmd/lectio-ui/main.go b/cmd/lectio-ui/main.go
index 43fc5ab..b08188c 100644
--- a/cmd/lectio-ui/main.go
+++ b/cmd/lectio-ui/main.go
@@ -27,12 +27,10 @@ Flags:
   -a, --all               show all parts (override config)
   -o, --offline            cache/sigla only, no network
   -l, --lectionary WHICH   new|trad (trad -> traditional)
-  -g, --lang LANG          traditional lectionary language: pl|en
   -v, --version            print the version and exit
   -h, --help               this help
 
-Versions: bt (Biblia Tysiąclecia) wuj (Wujek) vul (Wulgata) grb (Grecki)
-          drb (Douay-Rheims)
+Versions: wuj (Wujek) vul (Wulgata) grb (Grecki) drb (Douay-Rheims)
 
 Flags override config. Exit codes: 0 ok, 1 runtime error, 2 usage error.
 `
@@ -68,14 +66,14 @@ func run(args []string, stdout, stderr io.Writer) int {
 	}
 
 	var all, offline, reader bool
-	var bibleVer, lectionary, lang string
+	var bibleVer, lectionary string
 
 	fs := flag.NewFlagSet("lectio-ui", flag.ContinueOnError)
 	fs.SetOutput(stderr)
 	fs.Usage = func() { fmt.Fprint(stderr, helpText) }
 
-	fs.StringVar(&bibleVer, "b", "", "start on version: bt,wuj,vul,grb,drb")
-	fs.StringVar(&bibleVer, "bible", "", "start on version: bt,wuj,vul,grb,drb")
+	fs.StringVar(&bibleVer, "b", "", "start on version: wuj,vul,grb,drb")
+	fs.StringVar(&bibleVer, "bible", "", "start on version: wuj,vul,grb,drb")
 	fs.BoolVar(&reader, "R", false, "open the Bible reader (fuzzy book picker) instead of the daily view")
 	fs.BoolVar(&reader, "reader", false, "open the Bible reader (fuzzy book picker) instead of the daily view")
 	fs.BoolVar(&all, "a", cfg.All, "show all parts (override config)")
@@ -84,8 +82,6 @@ func run(args []string, stdout, stderr io.Writer) int {
 	fs.BoolVar(&offline, "offline", cfg.Offline, "cache/sigla only, no network")
 	fs.StringVar(&lectionary, "l", "", "new|trad")
 	fs.StringVar(&lectionary, "lectionary", "", "new|trad")
-	fs.StringVar(&lang, "g", "", "pl|en")
-	fs.StringVar(&lang, "lang", "", "pl|en")
 
 	if err := fs.Parse(rest); err != nil {
 		return 2
@@ -100,12 +96,8 @@ func run(args []string, stdout, stderr io.Writer) int {
 		fmt.Fprintln(stderr, "lectio-ui:", err)
 		return 2
 	}
-	if lang != "" && lang != "pl" && lang != "en" {
-		fmt.Fprintf(stderr, "lectio-ui: invalid --lang %q (want pl|en)\n", lang)
-		return 2
-	}
 	if bibleVer != "" && !config.ValidVersion(bibleVer) {
-		fmt.Fprintf(stderr, "lectio-ui: unknown version %q (want one of bt, wuj, vul, grb, drb)\n", bibleVer)
+		fmt.Fprintf(stderr, "lectio-ui: unknown version %q (want one of wuj, vul, grb, drb)\n", bibleVer)
 		return 2
 	}
 
@@ -114,9 +106,6 @@ func run(args []string, stdout, stderr io.Writer) int {
 	if lectionary != "" {
 		cfg.Lectionary = lectionary
 	}
-	if lang != "" {
-		cfg.TraditionalLang = lang
-	}
 
 	var mdl tea.Model = tui.New(cfg, date, bibleVer)
 	if reader {
diff --git a/cmd/lectio-web/main.go b/cmd/lectio-web/main.go
index 2e7fa5a..327496a 100644
--- a/cmd/lectio-web/main.go
+++ b/cmd/lectio-web/main.go
@@ -20,7 +20,6 @@ Flags:
   -p, --port N            port (overrides web_port; 0 = auto)
   -o, --offline            cache/sigla only, no network
   -l, --lectionary WHICH   new|trad (trad -> traditional)
-  -g, --lang LANG          traditional lectionary language: pl|en
   -v, --version            print the version and exit
   -h, --help               this help
 
@@ -52,7 +51,7 @@ func run(args []string, stdout, stderr io.Writer) int {
 
 	var offline bool
 	var port int
-	var lectionary, lang string
+	var lectionary string
 
 	fs := flag.NewFlagSet("lectio-web", flag.ContinueOnError)
 	fs.SetOutput(stderr)
@@ -64,8 +63,6 @@ func run(args []string, stdout, stderr io.Writer) int {
 	fs.BoolVar(&offline, "offline", cfg.Offline, "cache/sigla only, no network")
 	fs.StringVar(&lectionary, "l", "", "new|trad")
 	fs.StringVar(&lectionary, "lectionary", "", "new|trad")
-	fs.StringVar(&lang, "g", "", "pl|en")
-	fs.StringVar(&lang, "lang", "", "pl|en")
 
 	if err := fs.Parse(args); err != nil {
 		return 2
@@ -80,19 +77,11 @@ func run(args []string, stdout, stderr io.Writer) int {
 		fmt.Fprintln(stderr, "lectio-web:", err)
 		return 2
 	}
-	if lang != "" && lang != "pl" && lang != "en" {
-		fmt.Fprintf(stderr, "lectio-web: invalid --lang %q (want pl|en)\n", lang)
-		return 2
-	}
-
 	cfg.WebPort = port
 	cfg.Offline = offline
 	if lectionary != "" {
 		cfg.Lectionary = lectionary
 	}
-	if lang != "" {
-		cfg.TraditionalLang = lang
-	}
 
 	if err := web.Run(cfg); err != nil {
 		fmt.Fprintln(stderr, err)