feat: Module 11, Conditions (NOUN ON NOUN IS ..., checked per object at use; NEAR as the Expansion Drop)

Adds course/11-conditions: lesson, scenarios, nine test_11 tests in both
tracks, the cumulative reference (Module 10's plus conditions) and the NEAR
drop. The engine learns a condition role, rules carry conditions, and
Level.hasProperty and conversion evaluate content's condition checks against
the board whenever a rule is used. Resolution pairs only rules with the same
conditions. Catalog, harness contract, research notes and the diff-tracks
generator follow.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/diff-tracks.mjs

@@ -84,6 +84,7 @@ export function generateCase(seed, vocab) {
   const nouns = vocab.words.filter((w) => w.role === "noun").map((w) => w.name);
   const objectNouns = vocab.words.filter((w) => w.role === "noun" && !w.selects).map((w) => w.name);
   const properties = vocab.words.filter((w) => w.role === "property").map((w) => w.name);
+  const conditions = vocab.words.filter((w) => w.role === "condition").map((w) => w.name);
   const placeable = vocab.cards.filter((c) => c.type === "minion" && c.noun);
   const holdable = vocab.cards.filter((c) => c.type === "spell" || (c.type === "minion" && c.noun));
 
@@ -106,12 +107,18 @@ export function generateCase(seed, vocab) {
   const cardNouns = cards.map((c) => vocab.cards.find((v) => v.name === c.card).noun);
   const subjects = [...objectKinds, ...cardNouns];
 
-  // Whole sentences, in a row or a column: NOUN [AND NOUN] IS [NOT] (PROPERTY | NOUN) [AND ...].
+  // Whole sentences, in a row or a column: NOUN [AND NOUN] [CONDITION NOUN [AND NOUN]] IS [NOT]
+  // (PROPERTY | NOUN) [AND ...]. A condition only with a vocabulary that has condition words
+  // (Module 11 on), so the cases of earlier modules' vocabularies don't change.
   const sentence = (first) => {
     // The first is the player's: the first object noun IS YOU (that noun always has an object).
     if (first) return [objectKinds[0], "IS", "YOU"];
     const line = [chance(0.7) ? pick(subjects) : pick(nouns)];
     if (chance(0.15)) line.push("AND", pick(subjects));
+    if (conditions.length && chance(0.4)) {
+      line.push(pick(conditions), pick(subjects));
+      if (chance(0.2)) line.push("AND", pick(nouns));
+    }
     line.push("IS");
     if (chance(0.15)) line.push("NOT");
     line.push(chance(0.75) ? pick(properties) : pick(nouns));