hldays adds a source and verbatim quote to every holiday record

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The third post in the hldays series explains how each holiday record is backed by a source, including a URL, a human reference, a verbatim quote, and a verification date. The author gives examples such as Alenquer's municipal holiday and Madeira's Autonomy Day, citing a regional decree. Records carry one of two statuses, verified or unverified, and a build-time check blocks deployment if a verified record lacks a URL and verification date. Official sources such as laws and government registries are required for verification, while news articles and Wikipedia serve only as leads. The post also notes that Portugal's 308 municipalities have no single official holiday list, so the data was collected in several passes.

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