build(release): generate GitHub release notes

[thomhurst]

Closes #425

What changed

• replaced CHANGELOG-based release bodies with GitHub-generated notes categorized by existing labels
• added a dry-run preview and retry-safe regeneration for existing releases
• removed CHANGELOG extraction/verification and moved dead pre-release API linting into Verify-Docs.ps1
• moved the 1.0 migration narrative and corrected rename table into a dedicated upgrading guide
• pointed README and NuGet package release-note metadata at GitHub Releases

Why

The hand-maintained changelog was already stale and release publication depended on it. Merged PRs are the authoritative audit trail; GitHub-generated notes keep that trail complete while the dedicated upgrade guide preserves curated migration guidance.

Validation

• pwsh scripts/Verify-ReleaseWorkflow.ps1
• pwsh scripts/Verify-ReleaseApiBaselines.ps1 -Version 1.0.0
• dotnet pack Kevlar.slnx -c Release
• pwsh scripts/Verify-Packages.ps1 -PackagesPath artifacts/package/release -Version 0.0.0-local
• pwsh scripts/Verify-Docs.ps1
• pwsh scripts/Verify-Repo.ps1
• pwsh scripts/Verify-DocSnippets.ps1 -PackagesPath artifacts/package/release -Version 0.0.0-local -NoImplicitUsings (isolated NuGet cache)
• npm run build under docs/
• Publish-GitHubRelease.ps1 -DryRun generated a categorized v1.0.0 body from v0.10.0
• injected RetryNumber fixture was rejected by Verify-Docs.ps1

[coderabbitai]

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[chatgpt-codex-connector]

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