fix(replay): bug TypeError log + flag pré-check OCR off par défaut (démo GHT)

Diagnostic post-bench E2E (rapport docs/E2E_TEST_RUN_2026-05-08.md) :

1. BUG SILENCIEUX MAJEUR (api_stream.py:4549) — quand le pré-check OCR
   rejette, mon code de rejet hier soir met x_pct=None / y_pct=None.
   Le log structuré faisait result.get('x_pct', 0):.4f → None:.4f →
   TypeError → réponse "analysis_error" qui MASQUE le vrai motif
   "rejected_text_mismatch". Conséquence : pendant toute la session
   du 7 mai soir, les rejets pré-check ont été silencieusement
   transformés en erreurs analyse → cascade locale Léa V1 → clic au pif.
   Fix : `(result.get('x_pct') or 0):.4f` traite None | None | 0
   uniformément.

2. FLAG ENV pré-check OFF par défaut — le pré-check
   _validate_text_at_position introduit hier soir a 2 défauts
   identifiés par le bench E2E sur 8 click_anchor :
   * radius_px=200 trop petit pour les tabs à 2 tokens (Examens
     cliniques, Synthèse Urgences) — OCR voit un crop tronqué
     "Maquette POC ler en cours Codage Statistiques" qui n'inclut
     pas "Examens" → fuzzy match 1/2 = 50% < seuil 0.60 → REJET.
     À radius 300/400 le mot est inclus → match passe.
   * min_token_ratio=0.60 trop strict pour cibles 2 tokens.

   Solution démo : flag env RPA_ENABLE_TEXT_PRECHECK (défaut "false").
   Le pré-check est désactivé par défaut → retour au comportement
   stable d'avant-hier (hybrid_text_direct ≥ 0.80 utilisé direct,
   exemption drift préservée). Code et fonction _validate_text_at_position
   conservés en place pour reprise post-démo après calibrage radius
   adaptatif (≈ 0.17 × min(screen_w, screen_h)) et token_ratio descendu
   à 0.50.

   Pour ré-activer en dev/test : `RPA_ENABLE_TEXT_PRECHECK=true`
   dans .env.local ou env du service rpa-streaming.

Inclus aussi :
- docs/E2E_TEST_RUN_2026-05-08.md (rapport agent test E2E ~1700 mots)
- tests/e2e/urgence_aiva_demo_expected.yaml (tolérances re-écrites)
- tests/e2e/fixtures/urgence_aiva_demo/live/*.png (8 fixtures
  recapturées headless 1920x1080 pour itérer demain)
- _ocr_inventory.json + _run_resolve_results.json (raw runs)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/e2e/fixtures/urgence_aiva_demo/_ocr_inventory.json

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tests/e2e/fixtures/urgence_aiva_demo/_ocr_inventory_may5.json

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+}

tests/e2e/fixtures/urgence_aiva_demo/_run_resolve_results.json

@@ -0,0 +1,168 @@
+[
+  {
+    "by_text": "25003284",
+    "fixture": "live/landing.png",
+    "result": {
+      "resolved": true,
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+    "result": {
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+      "_screen_size": [
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+        1080
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+  },
+  {
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+    "fixture": "live/dossier_examens-cliniques.png",
+    "result": {
+      "resolved": true,
+      "method": "hybrid_text_direct",
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+        1080
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+        1080
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+      "method": "fallback",
+      "reason": "analysis_error",
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+        1080
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+  },
+  {
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+    "fixture": "live/dossier_synthese-urgences.png",
+    "result": {
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+      "_screen_size": [
+        1920,
+        1080
+      ]
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+  },
+  {
+    "by_text": "Coller ou saisir le dossier patient",
+    "fixture": "live/dossier_codage.png",
+    "result": {
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+      "method": "strict_vlm_template_failed",
+      "reason": "vlm_and_template_all_failed",
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+      ]
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+  },
+  {
+    "by_text": "Justification de la décision",
+    "fixture": "live/dossier_codage.png",
+    "result": {
+      "resolved": false,
+      "method": "strict_vlm_template_failed",
+      "reason": "vlm_and_template_all_failed",
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+]