feat: module 10 spellgrid

SpellGrid capstone: Part I's card engine and Part II's grid engine joined at
three seams (rules -> aura data, hazard victims -> one destroy Sequence,
Sequence end -> write text, remove the dead, reparse). Three levels with
scripted solutions, a naive-timing test via a harness-only hook that
reverses the END_OF_PHASE list, CLIs in both tracks, the BATTLECRY IS DOUBLE
Expansion Drop, SpellGrid cards and words in course/cards and the catalog,
level schema cards/hand, and tools staging/copying of module levels.

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

tools/verify-references.mjs

@@ -1,6 +1,7 @@
 #!/usr/bin/env node
 // For each module <= N with a reference/: copy reference + tests of modules 01..module into a temp dir, run tests.
-// course/cards (the card data, loaded by the references from Module 5) is staged as <dir>/cards.
+// course/cards (the card data, loaded by the references from Module 5) is staged as <dir>/cards,
+// and each tested module's levels/ (the puzzle levels its tests load, from Module 10) as <dir>/levels.
 import { cpSync, existsSync, mkdirSync, mkdtempSync, rmSync } from "node:fs";
 import { spawnSync } from "node:child_process";
 import { tmpdir } from "node:os";
@@ -35,6 +36,7 @@ export function stage(plan, lang) {
   mkdirSync(join(dir, "tests"), { recursive: true });
   for (const t of plan.testModules) {
     for (const f of testFiles(t.path, lang)) cpSync(f, join(dir, "tests", basename(f)));
+    if (existsSync(join(t.path, "levels"))) cpSync(join(t.path, "levels"), join(dir, "levels"), { recursive: true });
   }
   const cards = join(courseRoot(), "cards");
   if (existsSync(cards)) cpSync(cards, join(dir, "cards"), { recursive: true });