fix(ci): embarquer les fixtures de dialogue dans le paquet de test

Les tests de dialog-detection lisaient leurs captures dans
spikes/s3-tui/captures/, dossier exclu du suivi git (.gitignore :
spikes/**/captures/ + la règle globale *.log). Verts en local mais
absents au checkout CI → ENOENT sur 9 tests.

Les 5 fixtures réellement utilisées sont déplacées dans
packages/server/test/fixtures/dialogs/ et renommées *.raw (sans .log)
pour échapper aux deux règles d'ignore. Le test pointe désormais ce
dossier. Suite hermétique : 175/175 verts, fixtures versionnées.

packages/server/test/fixtures/dialogs/deny-esc2.raw

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+Quicksafetycheck:Isthisaprojectyoucreatedoroneyoutrust?(Likeyourowncode,awell-knownopensource␍
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+ClaudeCode'llbeabletoread,edit,andexecutefileshere.␍
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+]8;id=zaxmda;https://code.claude.com/docs/en/securitySecurity guide]8;;␍
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+❯1.Yes,Itrustthisfolder␍
+2.No,exit␍
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+Entertoconfirm·Esctocancel␍
+[?2026l[>0q[?2026h␍Yes, I trust this folder✔␍
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+[?25h[?2026l[?2026h[?25l␍ ⚠ 2 setup issues: MCP · /doctor␍␍ ▎ Meet Fable 5, our newest model for complex, long-running work. Try anytime with /model.␍▎ Included in yourplan limits until Jun 22, then switch to usage credits to continue.␍
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+◉xhigh·/effort␍
+[?25h[?2026l]0;⠂ Claude Code[?2026h[?25l␍❯ Run this exact bash command and show me its output: node -e "console.log('should-be-denied')" — do not do anything    ␍  else.                                                                                                                 ␍␍✽ Unfurling… ␍␍
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+❯ ␍
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+esctointerrupt◉xhigh·/effort␍
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+[?25h[?2026l]0;⠂ Execute Node.js command in bash[?2026h[?25l␍●Voici la sortie dela commande :␍  should-be-denied␍␍✻ Unfurling… (5s · ↓ 173 tokens · thought for 1s)␍␍
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+❯ ␍
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────␍
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+[?25h[?2026l]0;✳ Execute Node.js command in bash[?2026h[?25l␍✻Churned for 5s␍❯ ␍? for shortcuts · ← for agents␍
+[?25h[?2026l[?2026h[?25l␍␍
+You'veused94%ofyoursessionlimit·resets7pm(Europe/Paris)·/usage-creditstorequestmore␍
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+Resume this session with:
+claude --resume 68c4db8a-2120-4ab9-9c03-cd3313675be5
+