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-demo/constants.ts

@@ -0,0 +1,76 @@
+/** Interactive Demo schema v1 — caps & allowlists (brainstorm 2026-07-22). */
+
+export const INTERACTIVE_DEMO_SCHEMA_VERSION = 1 as const
+
+export const INTERACTIVE_DEMO_CAPS = {
+  maxScenes: 5,
+  maxActs: 8,
+  maxStepsPerAct: 12,
+  maxAnnotationsPerStep: 5,
+  maxPanelsPerScene: 2,
+  maxJsonBytes: 64 * 1024,
+} as const
+
+export const PATTERN_IDS = [
+  'progressiveReveal',
+  'spotlightTour',
+  'accumulate',
+  'compareBeforeAfter',
+  'chartBuild',
+  'heatmapFill',
+  'overview',
+  'flowTrace',
+] as const
+
+export const INTENT_IDS = [
+  'highlight',
+  'flow',
+  'cache',
+  'compute',
+  'output',
+  'warning',
+] as const
+
+export const SCOPE_IDS = ['transient', 'act', 'scene'] as const
+
+export const ANNOTATION_KINDS = ['circle', 'arrow', 'badge', 'callout'] as const
+
+export const PANEL_TYPES = ['svg-scene', 'chart', 'heatmap-matrix'] as const
+
+export const TRANSITIONS = ['fade', 'cut'] as const
+
+export const CHART_TYPES = ['line', 'bar', 'area'] as const
+
+/**
+ * Human / locale strings — may contain hex/rgb in prose; changeable by translateDemo.
+ * Must stay in sync between color-scan skip, translate strip, and docs.
+ */
+export const HUMAN_STRING_KEYS = [
+  'lang',
+  'speak',
+  'title',
+  'text',
+  'disclaimer',
+  'label',
+  'rowLabels',
+  'colLabels',
+] as const
+
+export type HumanStringKey = (typeof HUMAN_STRING_KEYS)[number]
+
+const HUMAN_STRING_KEY_SET = new Set<string>(HUMAN_STRING_KEYS)
+
+export function isHumanStringKey(key: string): boolean {
+  return HUMAN_STRING_KEY_SET.has(key)
+}
+
+/** Hex / rgb color literals forbidden in non-human JSON fields (P11). */
+export const FORBIDDEN_COLOR_RE =
+  /#(?:[0-9a-fA-F]{3,4}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8})\b|\brgba?\s*\(/i
+
+/**
+ * Future generation-prompt rule (not a validator cap):
+ * speak ≈ 1–2 sentences, ~25 words max — tempo is decided at writing time.
+ */
+export const SPEAK_WRITING_RULE =
+  'speak ≈ 1–2 phrases, ~25 mots max — le tempo de la démo se décide à l’écriture, pas au rendu.'