Addendum B themes: religious orders + liturgical seasons, colour-only, user-extensible

Replace dev-palette themes with original ascetic sets: religious orders
(desert_fathers, benedictines, franciscans, memento_mori, camedules) and
liturgical seasons (advent, nativity, lent, easter, pentecost, ordinary),
plus transfiguration (default). Colour-only, no gimmicks (base.css owns
all layout/type). Users can drop *.css in ~/.config/lectio/themes/;
web_theme accepts any, serve-time fallback. docs/THEMES.md documents the
role classes.

1 files changed, 31 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 a56f345..76aa26d 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
@@ -306,15 +306,36 @@ self-contained single binary — no cgo, no build step.
   responsive compare columns.
 - **Themes.** Minimal, ascetic (spare typography, generous whitespace, no
   gradients/shadows/rounded chrome — just the palette applied to the role
-  classes). Embedded CSS themes based on the popular named palettes, switchable
-  live in the UI and defaulted by `web_theme`: `transfiguration` (the user's own
-  palette — dark hill-green, parchment text, gold accents; canonical hex in
-  `~/git/transfiguration-themes/palettes/transfiguration.json`), plus
-  `catppuccin`, `tokyonight`, `gruvbox`, `nord`, `dracula`, `solarized`,
-  `everforest`, `rosepine`, `onedark`. The colour roles (heading / citation /
-  verse number / refrain / body) are CSS classes each theme restyles. The active
-  theme is stored in a cookie; `web_theme` is the initial default (ships as
-  `transfiguration`).
+  classes). Original themes evoking religious orders / spiritual traditions,
+  switchable live and defaulted by `web_theme`:
+  - `transfiguration` — the user's own palette (dark hill-green, parchment text,
+    gold halos; canonical hex in `~/git/transfiguration-themes/palettes/transfiguration.json`). Default.
+  - `desert_fathers` — light: sun-bleached sand and ochre, austere (Egyptian desert hermits).
+  - `benedictines` — dark: near-black habit, illuminated gold, parchment (ora et labora).
+  - `franciscans` — warm undyed-brown habit with olive/creation greens (Il Poverello).
+  - `memento_mori` — stark greyscale, ash and bone, one dried-blood accent (contemplative austerity).
+  - `camedules` — light: white habit, cool slate-blue and sage, serene (Camaldolese hermits).
+
+  And a set following the **liturgical seasons** and their proper colours:
+  - `advent` — violet, contemplative preparation.
+  - `nativity` — white and gold, the light of Christmas (light).
+  - `lent` — ashen, desaturated violet, penitential.
+  - `easter` — radiant white and gold, the Paschal glory (light).
+  - `pentecost` — the red flame of the Spirit, gold tongues of fire.
+  - `ordinary` — green, growth and hope (light).
+
+  **Colour only — no gimmicks.** A theme file sets ONLY colour values for the
+  role variables/classes (heading / citation / verse number / refrain / body /
+  links / borders). No background images, no per-theme fonts, no ornaments,
+  animations, or effects. All layout, typography and spacing live once in the
+  shared `base.css`; themes never touch them. The active theme is stored in a
+  cookie; `web_theme` is the initial default (ships as `transfiguration`).
+- **User themes.** Others can add their own: any `*.css` in
+  `${XDG_CONFIG_HOME:-~/.config}/lectio/themes/` becomes a selectable theme named
+  after its filename stem (a user file overrides a built-in of the same name). A
+  custom theme only needs to define the documented role classes. So `web_theme`
+  may name a built-in or a user theme; an unknown name falls back to the default
+  at serve time with a warning (not a hard config error).
 - **Reuse.** Consumes the same core: `readings.Load` → `[]liturgy.Section`,
   `render.GatherVersion`'s `(label, blocks)` fed into templates. No changes to
   the domain packages — `internal/web` imports them, never the reverse.
@@ -334,7 +355,7 @@ 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
-web_theme        = "transfiguration"  # theme: transfiguration|catppuccin|tokyonight|gruvbox|nord|dracula|solarized|everforest|rosepine|onedark
+web_theme        = "transfiguration"  # built-in order/season theme or a user theme in ~/.config/lectio/themes/ (see docs/THEMES.md)
 web_port         = 0        # lectio-web port; 0 = auto-pick a free port
 
 # Which parts to show. Both tables are commented out -> every part is shown.