Spec+plan: traditional lectionary (missalemeum) + per-part config

- config: lectionary=new|traditional, traditional_lang=pl|en, and
  commented-out [parts.new]/[parts.traditional] per-part toggles (parsed
  as a map: a part shows unless explicitly false).
- traditional source: missalemeum API (en/pl only; no Latin) mapped to
  the shared []Section; scripture parts get the version-compare via their
  citation + embedded vul, prayers are vernacular-only.
- new internal/tradlit package + Load router by lectionary; plan addendum
  A with the tradlit task and amendments to Section/config/Load/render/cli.

1 files changed, 96 insertions, 10 deletions

diff --git a/docs/superpowers/specs/2026-07-23-lectio-go-rewrite-design.md b/docs/superpowers/specs/2026-07-23-lectio-go-rewrite-design.md
index f0889e3..2c6824b 100644
--- a/docs/superpowers/specs/2026-07-23-lectio-go-rewrite-design.md
+++ b/docs/superpowers/specs/2026-07-23-lectio-go-rewrite-design.md
@@ -51,7 +51,8 @@ Module: `github.com/lukaszkasprzak/lectio`. Location: `~/git/projects/lectio`.
 ```
 cmd/lectio/main.go        -> cli.Run(args, stdin, stdout, stderr) int
 cmd/lectio-ui/main.go     -> load config+data, tui.New(...), tea.NewProgram(...).Run()
-internal/liturgy/         fetch + parse niedziela.pl; cache; sigla harvest/offline
+internal/liturgy/         Section type; fetch + parse niedziela.pl; cache; harvest/offline; Load router
+internal/tradlit/         missalemeum API: fetch + parse 1962 propers into []Section
 internal/bible/           embedded corpora + reference lookup + book aliases
 internal/psalter/         psalm versification (port of psalm_versify.py)
 internal/render/          text rendering: compare columns, section text (CLI)
@@ -103,7 +104,10 @@ subset the tool actually feeds it:
   (`tabnowy0all`), fall back to `tabstary0all` with a warning; extract each
   section's heading, subtitle, citation, and paragraphs. Fail loudly if the tab
   is present but empty or absent (layout change).
-- `Section{Heading, Subtitle, Citation, Paragraphs}`.
+- `Section{Heading, Subtitle, Citation, PartID string; Paragraphs [][]string}`
+  (shared by both lectionaries; `PartID` drives part-filtering — see Config).
+- `Load(cfg, opts) ([]Section, error)` routes to this modern source or to
+  `tradlit` by `cfg.Lectionary`, then applies part-filtering.
 
 ### Caching (fast repeat loads)
 Two layers under `~/.cache/lectio/` (honor `XDG_CACHE_HOME`):
@@ -145,6 +149,42 @@ Tysiąclecia) is online-only and not embedded (copyright); **offline, `wuj`
 replaced by `wuj` where needed (see Config → `offline`). A date absent from the
 harvest gives a clear "run `lectio update` online" error.
 
+## Lectionaries: new vs traditional
+
+The `lectionary` config selects the source; both produce a `[]Section`, so the
+render/CLI/TUI/cache layers are shared.
+
+- **`new`** (default) — the modern Ordinary-Form readings from niezbednik.niedziela.pl
+  (`internal/liturgy`), as described above.
+- **`traditional`** — the 1962-Missal propers from the missalemeum API
+  (`internal/tradlit`): `GET https://www.missalemeum.com/{lang}/api/v5/proper/{date}`,
+  `lang` = `traditional_lang` (`pl` or `en` — the only two the API serves). The
+  JSON is `[{info{title,...}, sections:[{id,label,body:[["...text..."]]}]}]`. Each
+  section becomes a `Section{Heading:label, PartID:lower(id), Paragraphs, Citation}`;
+  the citation is extracted from the `*Book c:v*` marker embedded in a reading's
+  body. Section ids: `Introitus, Oratio, Lectio, Graduale, Evangelium,
+  Offertorium, Secreta, Communio, Postcommunio` (plus Alleluia/Tractus/commemorations).
+
+**How the versions apply.** A traditional `Section` carries missalemeum's
+vernacular text as its `Paragraphs` (the `pl`-role source text) and, for scripture
+propers, a `Citation`. So the scripture parts (Introit, Epistle, Gradual, Gospel,
+Offertory, Communion) flow through the *same* version-compare as the modern mode —
+`vul` (Latin), `wuj`, `grb`, `drb` looked up from the embedded corpora by citation.
+The prayer parts (Collect, Secret, Postcommunion) have no citation, so they render
+only the missalemeum vernacular.
+
+**Latin caveat.** The missalemeum v5 API returns vernacular only (en/pl) — no
+Latin. Latin for the *readings* comes from the embedded `vul` corpus via the
+citation; Latin for the *prayers* is not available and those show vernacular only.
+This is a documented limitation, surfaced with a short note on prayer sections.
+
+**Caching / offline.** Traditional pages cache like modern ones (`{date}.json`
+under a `traditional/` subdir so the two lectionaries don't collide). `lectio
+update` harvests whichever lectionary is active into its own sigla file
+(`sigla.tsv` / `sigla-traditional.tsv`); offline builds the scripture-part
+sections from the harvested citations. Prayer text is not harvested (it is not a
+citation), so offline traditional shows the readings only.
+
 ## Versions and psalm systems
 
 Ported from `ewangelia.py` constants:
@@ -202,6 +242,8 @@ lectio help | lectio -h | lectio <cmd> -h
 - `--refresh` bypasses the cache and re-fetches.
 - `--offline` (global) skips the network and uses the sigla TSV; also applied
   automatically when a fetch fails.
+- `--lectionary new|traditional` and `--lang pl|en` (global) override the config
+  `lectionary` / `traditional_lang` for one run.
 - `update` harvests forward from today (or `--from D`) up to `--days N` (default:
   until the unpublished horizon), writing the sigla TSV.
 - Flags override config. Exit codes: 0 ok, 1 runtime error (fetch/parse), 2
@@ -252,16 +294,55 @@ fixed. The CLI stays plain text (colour is a TUI concern).
 run, honoring `XDG_CONFIG_HOME`) → built-in defaults. Flags override.
 
 ```toml
-schema_version  = 1
-versions        = ["pl", "wuj", "vul", "grb", "drb"]  # compare set + TUI cycle order
-default_version = "pl"      # TUI start / `lectio show` default
-width           = 0         # CLI wrap width; 0 = detect terminal
-all             = false     # default to all readings (true) or just the gospel (false)
-offline         = false     # true = never fetch; read only harvested sigla + cache
+schema_version   = 1
+lectionary       = "new"    # "new" (niedziela.pl) or "traditional" (missalemeum, 1962)
+traditional_lang = "pl"     # vernacular for traditional propers: "pl" or "en"
+versions         = ["pl", "wuj", "vul", "grb", "drb"]  # compare set + TUI cycle order
+default_version  = "pl"     # TUI start / `lectio show` default
+width            = 0        # CLI wrap width; 0 = detect terminal
+all              = false    # default to all parts (true) or just the gospel (false)
+offline          = false    # true = never fetch; read only harvested sigla + cache
+
+# Which parts to show. Both tables are commented out -> every part is shown.
+# Uncomment a table and set a part to false to hide it; parts you don't list
+# stay shown. (Parsed as a map: a part is hidden only if explicitly false.)
+#
+# [parts.new]
+# pierwsze_czytanie = true   # 1. czytanie (1st reading)
+# psalm             = true   # Psalm
+# drugie_czytanie   = true   # 2. czytanie (2nd reading, on feasts)
+# aklamacja         = true   # Aklamacja (acclamation)
+# ewangelia         = true   # Ewangelia (gospel)
+#
+# [parts.traditional]
+# introitus    = true   # Introit
+# oratio       = true   # Collect
+# lectio       = true   # Epistle
+# graduale     = true   # Gradual / Alleluia / Tract
+# evangelium   = true   # Gospel
+# offertorium  = true   # Offertory
+# secreta      = true   # Secret
+# communio     = true   # Communion
+# postcommunio = true   # Postcommunion
 ```
 
-Unknown versions in config are rejected with a clear error. Invalid TOML falls
-back to defaults with a stderr warning.
+`Config` fields: `SchemaVersion int`, `Lectionary string`, `TraditionalLang
+string`, `Versions []string`, `DefaultVersion string`, `Width int`, `All bool`,
+`Offline bool`, and `Parts map[string]map[string]bool` (the `[parts.new]` /
+`[parts.traditional]` tables). `Lectionary` must be `new` or `traditional`;
+`TraditionalLang` must be `pl` or `en`; unknown versions/values are rejected with
+a clear error. Invalid TOML falls back to defaults with a stderr warning.
+
+**Part filtering.** `Config.PartShown(lectionary, partID string) bool` returns
+`true` unless `Parts[lectionary][partID]` is present and `false`. So a commented
+(empty) `Parts` shows everything, and a user hides a part by uncommenting the
+table and setting just that part to `false`. Part IDs: for `new`,
+`pierwsze_czytanie`/`psalm`/`drugie_czytanie`/`aklamacja`/`ewangelia` (matched
+from the niedziela heading); for `traditional`, the missalemeum section ids
+lower-cased (`introitus`, `oratio`, `lectio`, `graduale`, `evangelium`,
+`offertorium`, `secreta`, `communio`, `postcommunio`). Filtering applies whenever
+all parts are in play (`--all`, `compare`, the TUI); the gospel-only default
+(`all = false`) always shows just the gospel / `evangelium`.
 
 `offline = true` (or the `--offline` flag) makes lectio work purely from the
 `lectio update` harvest and cache — it never touches the network, and `pl`
@@ -311,6 +392,11 @@ network-free daily read.
 - **psalter**: unit tests for `drb_verse` on titled/untitled/2-line-title psalms.
 - **liturgy.Parse**: fixture tests against a few cached HTML pages (a normal day,
   a split-reading feast, an unpublished date), asserting sections/citations.
+- **tradlit.Parse**: fixture test against a saved missalemeum JSON response
+  (2026-07-22), asserting the proper sections, part ids, the extracted Gospel
+  citation, and vernacular paragraphs.
+- **config.PartShown**: a commented (empty) `Parts` shows all; `{new:{psalm:false}}`
+  hides only the psalm and keeps the rest shown.
 - **liturgy cache + sigla**: round-trip the parsed JSON cache; harvest sigla from
   fixture pages into a temp TSV and read them back; offline `Load` builds sections
   from the TSV and renders the embedded versions with `pl` noted unavailable.