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).

1 files changed, 1 insertions, 1 deletions

diff --git a/internal/readings/readings_test.go b/internal/readings/readings_test.go
index f3375f6..143b43e 100644
--- a/internal/readings/readings_test.go
+++ b/internal/readings/readings_test.go
@@ -103,7 +103,7 @@ func TestLoadModern(t *testing.T) {
 // needs the network, and yields the EF epistle+gospel with a header name.
 func TestLoadTraditional(t *testing.T) {
 	cfg := config.Config{Lectionary: "traditional"}
-	secs, info, err := Load(cfg, Options{Date: "2026-07-22", Offline: true, All: true})
+	secs, info, err := Load(cfg, Options{Date: "2026-07-22", All: true})
 	if err != nil {
 		t.Fatalf("Load: %v", err)
 	}