Update brief document strategy section

{
  "metadata": {
    "h1": "How to choose running shoes",
    "projectContext": "Q2 Brand Tracking content push for the running category",
    "urlStructure": "/blog/how-to-choose-running-shoes",
    "contentType": "guide",
    "metaTitle": "How to Choose Running Shoes: A Beginner Guide",
    "metaDescription": "Pick the right running shoes with our step-by-step guide covering gait, cushioning, and fit.",
    "brandKitId": "3fa85f64-5717-4562-b3fc-2c963f66afa6"
  },
  "keywords": {
    "primaryKeyword": "best running shoes",
    "primaryVolume": 27000,
    "secondaryKeywords": [
      {
        "keyword": "running shoes for flat feet",
        "volume": 8100,
        "selected": true,
        "source": "auto"
      }
    ],
    "competitorUrls": [
      {
        "url": "https://nike.com/air-max",
        "domain": "nike.com",
        "position": 3
      }
    ],
    "wordCountObjective": 1500,
    "searchIntentDescription": "Informational — readers want a practical buying guide"
  },
  "strategy": {
    "differentiationStrategy": "Lead with hands-on testing data competitors lack",
    "internalLinks": [
      {
        "url": "https://nike.com/running-guide",
        "anchorText": "our complete running guide"
      }
    ],
    "questionsToAnswer": [
      {
        "question": "How do I pick the right running shoe size?",
        "selected": true,
        "source": "paa"
      }
    ],
    "lexicalField": {
      "unigrams": [
        "cushioning",
        "pronation"
      ],
      "bigrams": [
        "arch support"
      ],
      "trigrams": [
        "best running shoes"
      ]
    },
    "namedEntities": [
      "Nike",
      "Asics",
      "Brooks"
    ]
  },
  "outline": {
    "introductionInstructions": "Open with a relatable scenario about buying the wrong shoes.",
    "enableTldr": true,
    "sections": [
      {
        "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
        "level": "h2",
        "title": "Finding your fit",
        "order": 1,
        "topicsToAddress": [
          "gait analysis",
          "sizing"
        ]
      }
    ]
  },
  "createdAt": "2026-05-25T10:30:00.000Z",
  "updatedAt": "2026-05-25T10:30:00.000Z",
  "version": 3
}