docs: scienting-math/1 tree kinds prescript and mark

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017R7sgDNvUGWY2zFPCq2JH6

schemas/math.schema.json

@@ -5,7 +5,7 @@
   "description": "One line of derived/math.jsonl: a formula of the package read in the form scienting-math/1 by a pinned tool, its tree, symbol keys and issues; never authoritative; spec/09-figures-tables-equations.md §9.4, spec/12-package.md §12.7.",
   "$defs": {
     "kind": {
-      "description": "What a tree node is. The kinds of scienting-math/1 are num, sym, text, const, oper, dots, empty, add, neg, pm, mp, mul, times, div, op, frac, binom, sqrt, root, pow, sub, prime, fact, apply, lim, sum, prod, coprod, int, iint, iiint, oint, bigcup, bigcap, abs, norm, angle, floor, ceil, braces, interval, rel, list, lines, cases, matrix and opaque (spec/09 §9.4). The schema takes any lowercase name, so that a later minor version of the form may add a kind; a consumer that meets a kind it does not know treats that node as it treats opaque.",
+      "description": "What a tree node is. The kinds of scienting-math/1 are num, sym, text, const, oper, dots, empty, add, neg, pm, mp, mul, times, div, op, frac, binom, sqrt, root, pow, sub, prime, fact, prescript, mark, apply, lim, sum, prod, coprod, int, iint, iiint, oint, bigcup, bigcap, abs, norm, angle, floor, ceil, braces, interval, rel, list, lines, cases, matrix and opaque (spec/09 §9.4). The schema takes any lowercase name, so that a later minor version of the form may add a kind; a consumer that meets a kind it does not know treats that node as it treats opaque.",
       "type": "string",
       "pattern": "^[a-z][a-z0-9-]*$",
       "examples": [