Why

changelog gh-release derives changelog entries from a GitHub release's body, but ReleaseNoteParser only recognized:

• * bullets (asterisk), and
• ### section headers.

That doesn't match the default release-drafter output — nor what docs-builder itself emits — which uses - bullets (- <title> by @<author> in #<n>) and level-2 (##) emoji headers. As a result the format was detected as Unknown, zero PR references were extracted, and the produced bundle was empty.

Found while dogfooding the changelog CDN flow on docs-builder's own 1.18.1 release:

Detected format: Unknown, found 0 PR references
→ No PR references found in release notes. No changelogs will be created.

What

• PrLineRegex: accept both * and - bullets (^[*-]\s+…).
• SectionHeaderRegex: accept headers at level 2 or deeper (^#{2,}\s+…).
• Format detection (HasEmojiSectionHeaders): trigger on ## rather than requiring ###.
• New ReleaseNoteParserTests covering the docs-builder format, plus regressions for the legacy (###/*) and GitHub-default shapes.

After the fix, the same release parses as:

Detected format: ReleaseDrafter, found 3 PR references
Inferred lifecycle: ga, target version: 1.18.1

Test plan

• dotnet test tests/Elastic.Changelog.Tests (746 passed, incl. 6 new)
• ./build.sh build --skip-dirty-check (lint + compile clean)
• Native AOT publish clean (no trim/AOT warnings)
• End-to-end changelog gh-release docs-builder 1.18.1 now detects ReleaseDrafter + 3 PRs

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