{
  "normalization": {
    "method": "article-body-sha256",
    "description": "Each digest is sha256 over the UTF-8 bytes of the <article class=\"devsite-article\">...</article> region extracted from the raw HTML response -- NOT the full page. Hashing the full raw HTML is not reproducible: every fetch embeds a per-request <script type=\"application/json\" analytics> blob whose JSON keys serialize in non-deterministic order, a CSP nonce regenerated per request, and an inline feature-flag bootstrap array whose element order also varies per request. None of that reflects the guide's actual content. The <article class=\"devsite-article\"> region contains the guide's rendered content (headings, paragraphs, lists, tables) and excludes all of the above -- verified byte-identical across two consecutive fetches for all 30 pages below. See PROVENANCE.md's 'sources.json normalization' section for the full reproduction method and evidence.",
    "extractionPattern": "<article class=\"devsite-article\">.*?</article>",
    "extractionFlags": "dotall, first match",
    "hashedBytesField": "bytes -- the byte length of the EXTRACTED region (UTF-8), not the raw page. A future re-check with a matching `bytes` but different `sha256` (or vice versa) signals the extraction may have changed shape rather than the content, and should be triaged before treating it as drift.",
    "fetchMethod": "curl -- confirmed empirically (Fix wave C / Item 4) that a plain Node `fetch()` returns a materially different HTML variant of the same URL than `curl` does (not just the non-deterministic per-request noise described above -- a different response shape from the same server for the same request, attributable to the client). A future re-check must fetch with `curl`, not `fetch()` or another HTTP client, or a client-driven variant could be misread as guide drift."
  },
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