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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+78[?25h[?25l[?2004h[?1004h[?2031h[?2026h
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+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+
+Accessingworkspace:
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+/tmp/spike-s3-deny2
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+
+Quicksafetycheck:Isthisaprojectyoucreatedoroneyoutrust?(Likeyourowncode,awell-knownopensource
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+[?2026l]0;✳ Claude Code[?2026h
+╭───Claude Codev2.1.173─────────────────────────────────────────────────────────────────────────────────────────────╮
+│                                                    │ Tips for getting started                                        │
+│                 Welcome back Johan!│Run/inittocreateaCLAUDE.mdfilewithinstructionsforCla…│
+││───────────────────────────────────────────────────────────────│
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+│▝▜█████▛▘│FixedFable5modelnameswitha`[1m]`suffixnotbeingnorma…│
+│                     ▘▘ ▝▝                    │ Fixed a spurious "sandbox depenncies missing"startup warnin…│
+│   Opus 4.8 (1M context) with xh… · Claude Team ·   │ Sub-agnts can nowspawn their own sub-agents(upto5levels…│
+│Beehelp│/release-notes for more│
+│               /tmp/spike-s3-deny2             │       │
+╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
+
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+❯ Try "create a util logging.py that..."
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+? for shortcuts · ← for agents◉ xhigh · /effort
+[?25h[?2026l[?2026h[?25l
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+?forshortcuts·←foragents◉xhigh·/effort
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+Runthisexactbashcommandandshowmeitsoutput:node-e"console.log('should-be-denied')"—donotdoanything
+  else.
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
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+◉xhigh·/effort
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+[?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.                                                                                                                 
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+●Bash(node -e "console.log('should-be-denied')")
+  ⎿  Waiting…
+
+✻ Unfurling… (3s · ↓116 tokens · thinking with xhigh effort)
+
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+
+❯ 
+
+────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+
+esctointerrupt◉xhigh·/effort
+
+[?25h[?2026l]0;⠂ Execute Node.js command in bash[?2026h[?25l
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