stop lending Ruthenian law to churches it was never written for

Three Eastern Catholic jurisdictions borrowed the Ruthenian ruleset, so a
Melkite, a Romanian Greek Catholic and a Ukrainian Greek Catholic were each
told that fourteen days a year bound them under the particular law of the
Metropolia of Pittsburgh. That is the exact error the level/obligation split
exists to prevent, committed by the library itself.

Every Eastern Catholic church legislates its own fasting discipline. Those
three are now shown at the Typikon with nothing reported as binding, which is
the honest position: the calendar is known, the law is not. Their entries say
so and a test holds it, asserting both that no jurisdiction but ruthenian
carries that ruleset and that the three claim no binding days.

The README gains a section on these churches, since supporting them was never
meant to be something a reader had to infer from the jurisdiction list.

src/jurisdictions.rs

@@ -201,11 +201,12 @@ pub const JURISDICTIONS: &[Jurisdiction] = &[
     // eastern catholic
     Jurisdiction { key: "ruthenian", name: "Byzantine Catholic Metropolia of Pittsburgh", paschalion: GregP, menologion: RevJul, rule: Ruth, discipline: None, tradition: Sl, menaia: RUTHENIAN_MENAIA,
         note: "Gregorian throughout. Fasting is reported under Ruthenian particular law, which binds far less than the Typikon prescribes." },
-    Jurisdiction { key: "ugcc", name: "Ukrainian Greek Catholic Church", paschalion: JulP, menologion: RevJul, rule: Ruth, discipline: None, tradition: Sl, menaia: RUTHENIAN_MENAIA,
-        note: "Moved the fixed feasts to the Revised Julian calendar on 1 September 2023, keeping the Julian Paschalion. Eparchies outside Ukraine vary; several keep the Gregorian Paschalion." },
-    Jurisdiction { key: "melkite", name: "Melkite Greek Catholic Church", paschalion: GregP, menologion: RevJul, rule: Ruth, discipline: None, tradition: Gk, menaia: NO_MENAIA,
-        note: "Practice is not uniform: parishes in the Middle East commonly keep the Julian Paschalion for the sake of the local Orthodox." },
-    Jurisdiction { key: "romanian-catholic", name: "Romanian Greek Catholic Church", paschalion: GregP, menologion: RevJul, rule: Ruth, discipline: None, tradition: Gk, menaia: NO_MENAIA, note: "" },
+    Jurisdiction { key: "ugcc", name: "Ukrainian Greek Catholic Church", paschalion: JulP, menologion: RevJul, rule: Orth, discipline: None, tradition: Sl, menaia: RUTHENIAN_MENAIA,
+        note: "Moved the fixed feasts to the Revised Julian calendar on 1 September 2023, keeping the Julian Paschalion. Eparchies outside Ukraine vary; several keep the Gregorian Paschalion. Its particular law on fasting is its own and is not modelled here, so the days are shown at the Typikon and nothing is reported as binding." },
+    Jurisdiction { key: "melkite", name: "Melkite Greek Catholic Church", paschalion: GregP, menologion: RevJul, rule: Orth, discipline: None, tradition: Gk, menaia: NO_MENAIA,
+        note: "Practice is not uniform: parishes in the Middle East commonly keep the Julian Paschalion for the sake of the local Orthodox. Its particular law on fasting is its own and is not modelled here, so the days are shown at the Typikon and nothing is reported as binding." },
+    Jurisdiction { key: "romanian-catholic", name: "Romanian Greek Catholic Church", paschalion: GregP, menologion: RevJul, rule: Orth, discipline: None, tradition: Gk, menaia: NO_MENAIA,
+        note: "Its particular law on fasting is its own and is not modelled here, so the days are shown at the Typikon and nothing is reported as binding." },
 ];
 
 /// A jurisdiction key, a calendar name, or `None` for the default.

src/rules/ruthenian.rs

@@ -27,9 +27,15 @@
 //! only Great and Holy Wednesday turns on the reading. If your eparchy reads it
 //! the other way, that Wednesday binds too.
 //!
-//! Source: the Byzantine Catholic Metropolitan Church of Pittsburgh. Other
-//! Eastern Catholic churches legislate their own; where this library maps them
-//! onto this ruleset it is an approximation, and the jurisdiction entry says so.
+//! Source: the Byzantine Catholic Metropolitan Church of Pittsburgh, and that
+//! church only.
+//!
+//! Every Eastern Catholic church legislates its own fasting discipline, and
+//! this ruleset is **not** lent to the others. Borrowing it told a Melkite
+//! that fourteen days a year bound him under a law that was never his, which
+//! is precisely the error the level/obligation split exists to prevent. A
+//! church whose particular law has not been sourced is shown at the Typikon
+//! with no obligation claimed, and its entry says so.
 
 use super::{Context, Rule, Vocabulary};
 use crate::calendars::{Date, Weekday};