feat: page interactive, démos Play/Step et simulateur Carnot

Ajoute le pipeline PageSpec (validation, rendu, publication /p/{slug}),
les démos TipTap /demo, et le simulateur Carnot (modes frigo/PAC/moteur,
énergie kJ vs puissance W, unités K/°C/°F) avec correctifs d’équations KaTeX.

Co-authored-by: Cursor <cursoragent@cursor.com>

memento-note/lib/interactive-page/constants.ts

@@ -0,0 +1,86 @@
+/** Interactive Page schema v1 — caps & allowlists (spec Kimi / AttnRes). */
+
+export const INTERACTIVE_PAGE_SCHEMA_VERSION = 1 as const
+
+export const INTERACTIVE_PAGE_CAPS = {
+  maxSections: 8,
+  maxBlocksPerSection: 12,
+  maxDemosPerPage: 5,
+  maxSimsPerPage: 3,
+  maxOverviewCards: 4,
+  minOverviewCards: 2,
+  maxStatsItems: 5,
+  minStatsItems: 2,
+  maxJsonBytes: 128 * 1024,
+} as const
+
+export const SIM_CAPS = {
+  maxParams: 4,
+  maxComputed: 6,
+  maxExprChars: 200,
+} as const
+
+export const PAGE_BLOCK_TYPES = [
+  'prose',
+  'formula',
+  'callout',
+  'demo',
+  'chart',
+  'stats',
+  'table',
+  'image',
+  'sim',
+] as const
+
+export const CALLOUT_KINDS = [
+  'definition',
+  'warning',
+  'tip',
+  'note',
+] as const
+
+/**
+ * Human / locale strings — may contain hex in prose; skipped by color scan.
+ * Must stay in sync with validate + translate strip.
+ */
+export const PAGE_HUMAN_STRING_KEYS = [
+  // page-level
+  'lang',
+  'kicker',
+  'title',
+  'subtitle',
+  'meta',
+  'lead',
+  'badge',
+  'body',
+  'footer',
+  // blocks
+  'md',
+  'tex',
+  'caption',
+  'alt',
+  'value',
+  'label',
+  'columns',
+  'rows',
+  // sim blocks
+  'symbol',
+  'expr',
+  'intro',
+  'xLabel',
+  'yLabel',
+  // inherited from demos (speak etc. scanned via demo validator)
+  'speak',
+  'text',
+  'disclaimer',
+  'rowLabels',
+  'colLabels',
+] as const
+
+export type PageHumanStringKey = (typeof PAGE_HUMAN_STRING_KEYS)[number]
+
+const PAGE_HUMAN_SET = new Set<string>(PAGE_HUMAN_STRING_KEYS)
+
+export function isPageHumanStringKey(key: string): boolean {
+  return PAGE_HUMAN_SET.has(key)
+}