ConfluenceImportExport

Update the content-normalization contract after changing how Confluence storage-format is canonicalized or hashed, so persisted marker hashes don't silently mismatch. Use whenever you edit XmlContentNormalizer, RegexContentNormalizer, the HtmlEntities table, attribute-sort / whitespace / volatile-artifact-stripping rules, the SHA-256 hashing, or switch the active IContentNormalizer — or the moment ContentHasherTests.Golden_* fails. Keeps NormalizationContract.CurrentEpoch and GoldenNormalized in lockstep. Trigger on "нормализатор", "normalization changed", "golden vector failing", "bump epoch", or any diff touching Services/*Normalizer*.cs or the hash recipe.

Cut and publish a new release of Confluence Page Exporter — bump the version everywhere, roll the CHANGELOG, tag, and let CI build and publish the GitHub Release. Use whenever the user wants to ship/cut/publish a release or bump the version: "зарелизить", "выпустить версию", "сделать релиз 2.19.0", "release this", "ship a new version", or right after a batch of user-facing changes has landed on master and should go out. Handles the full ritual so nothing (version strings, bilingual CHANGELOG, tag) drifts out of sync.