fix: plafond strict 8 slides max + contrainte zod .max(8)

- JAMAIS plus de 8 slides quelle que soit la note
- Zod schema: .max(8) coupe l'array si le modèle déborde
- Prompt: ignore markdown/URLs dans le comptage de mots
- Chart seulement si vraies données numériques dans la note

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

memento-note/lib/ai/tools/slides.tool.ts

@@ -45,17 +45,21 @@ Available slide types:
 - "summary": title, items[] (conclusion with checkmarks)
 
 RULES:
-- Adapt the number of slides to the content: 3-4 slides for short notes (<200 words), 5-7 for medium, 8-12 for long/rich notes
+- MAXIMUM 8 slides total — NEVER exceed 8, even for long notes
+- Count only plain-text words, ignore markdown syntax, URLs, and metadata
+- For short notes (<100 plain words): 3-4 slides max
+- For medium notes (100-300 plain words): 5-6 slides max
+- For any other note: 7-8 slides max — HARD LIMIT
 - First slide MUST be type "title"
 - Last slide MUST be type "summary"
-- Include at least 1 "chart" or "stats" slide
+- Include at most 1 "chart" or "stats" slide — only if real numeric data exists in the note
 - Use VARIED types — never 2 identical types in a row
 - All text content must come from the source notes (never invent data)
 - Each bullet/card must be a real sentence (15+ words, not generic)`,
       inputSchema: z.object({
         title: z.string().describe('Short presentation title (6 words max)'),
         theme: z.string().optional().describe('Visual recipe: architectural-saas, midnight-cathedral, aurora-borealis, venture-pitch, clinical-precision, coastal-morning, etc.'),
-        slides: z.array(slideSchema).describe('Array of slide objects, each with a "type" field'),
+        slides: z.array(slideSchema).max(8).describe('Array of slide objects, 3-8 slides MAX'),
       }),
 
       execute: async ({ title, theme, slides }) => {