Create METHODOLOGY.md

METHODOLOGY.md

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+# Methodology
+
+## Objective
+
+The dataset organizes source-linked information that helps print shops research printable media and printer workflows without turning preliminary research into unsupported certification claims.
+
+## Source selection
+
+Priority is given to:
+
+1. Official manufacturer product pages.
+2. Official technical bulletins or product information bulletins.
+3. Brand-controlled application or workflow pages.
+
+Secondary commentary is not used as the sole support for a technical compatibility statement in this release.
+
+## Collection and normalization
+
+- A researcher records the source URL, brand or topic, workflow context, and intended use.
+- Product and printer family names are preserved as written by the source when practical.
+- Multi-value fields use semicolon-separated values in CSV and remain strings in JSONL.
+- Source review dates use ISO `YYYY-MM-DD` format.
+- Missing values are left blank rather than inferred.
+
+## Claim-risk labels
+
+- `High`: exact performance, warranty, certification, equivalency, durability, or cross-brand compatibility should be verified before publication.
+- `Medium`: official source context exists, but application-specific performance still requires current documentation and testing.
+- Blank: the source library does not assign a claim-risk score.
+
+## Quality controls
+
+- CSV files must have a stable header and consistent column count.
+- JSONL output must contain one valid JSON object per non-empty line.
+- Source URLs must use HTTP or HTTPS.
+- Dataset row totals must reconcile with the release manifest.
+- Technical compatibility is described as workflow context unless the cited source explicitly supports a stronger claim.
+
+## Update policy
+
+This release is a dated snapshot. Future releases should:
+
+1. Recheck source availability and product status.
+2. Record changed URLs or specifications.
+3. Preserve prior tagged releases for auditability.
+4. Increment the dataset version and publish a changelog.
+
+## Responsible use
+
+Users should confirm current manufacturer documentation, ICC/profile requirements, ink compatibility, laminate pairing, surface preparation, and application conditions. Production samples and controlled testing remain necessary.