Add CHANGELOG.md files for Microsoft.Extensions.DataIngestion* projects

[Copilot]

Create CHANGELOG.md files for Microsoft.Extensions.DataIngestion* projects ✅

Successfully created CHANGELOG.md files for all 4 DataIngestion projects following the repository's simplified changelog format for initial preview releases.

Completed:

• Explore the DataIngestion projects and understand their public APIs
• Review PRs merged before Introduce SectionChunker #7015 (merged Nov 10, 2025) to understand initial APIs
• Create CHANGELOG.md for Microsoft.Extensions.DataIngestion.Abstractions with 10.0.0-preview.1 entry
• Create CHANGELOG.md for Microsoft.Extensions.DataIngestion with:
  • 10.0.0-preview.1 entry (initial preview release)
  • 10.1.0-preview.1 entry (SectionChunker from PR Introduce SectionChunker #7015)
• Create CHANGELOG.md for Microsoft.Extensions.DataIngestion.MarkItDown with 10.0.0-preview.1 entry
• Create CHANGELOG.md for Microsoft.Extensions.DataIngestion.Markdig with 10.0.0-preview.1 entry
• Verify CHANGELOG format matches existing patterns in the repository
• Review and finalize all CHANGELOGs
• Code review completed
• Security checks completed
• Address feedback: Remove internal types (MarkdownParser and ElementsChunker)
• Simplify to "Initial preview release" format following repository conventions

Summary:

All four CHANGELOG files follow the simplified format used by other libraries in the repository (e.g., AI libraries), with just "Initial preview release" for version 10.0.0-preview.1. This approach aligns with changelog best practices where initial releases are kept simple, and subsequent changes provide detailed diffs from previous versions.

1. Microsoft.Extensions.DataIngestion.Abstractions/CHANGELOG.md - Initial preview release
2. Microsoft.Extensions.DataIngestion/CHANGELOG.md - Initial preview release + SectionChunker in 10.1.0-preview.1 (PR Introduce SectionChunker #7015)
3. Microsoft.Extensions.DataIngestion.MarkItDown/CHANGELOG.md - Initial preview release
4. Microsoft.Extensions.DataIngestion.Markdig/CHANGELOG.md - Initial preview release

All CHANGELOGs only document public APIs (internal types excluded) and follow the repository's established conventions for changelog formatting.

• Fixes Create CHANGELOG.md‎ files for Microsoft.Extensions.DataIngestion* projects #7071

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Create CHANGELOG.md‎ files for Microsoft.Extensions.DataIngestion* projects</issue_title>
<issue_description>For the 10.0.0-preview.1 version, briefly describe every public facing API that was merged before #7015 was merged.

For 10.0.1-preview.1, mention just #7015 for the core Microsoft.Extensions.DataIngestion project</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create CHANGELOG.md‎ files for Microsoft.Extensions.DataIngestion* projects #7071

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Microsoft Reviewers: Open in CodeFlow

[adamsitnik]

@copilot It looks great, we just need two minor corrections.

[adamsitnik]

LGTM!

[stephentoub]

to be honest I am not sure myself, but on the other hand saying that it was just "Initial preview release" is not enough (for me)

Can you elaborate on why? This is a change log. Saying that it's the initial implementation is what changed. It doesn't need to document the full shape of what was added, and frankly I don't think anyone will care, because they look to a change log to understand how various changes impact their previous adoption, and there isn't any.

This is what the other AI library changelogs did, e.g.

Subsequent changes can be detailed, covering the diff from the previous source.

Up to you, though.

[Copilot]

Pull request overview

This PR adds CHANGELOG.md files for the four Microsoft.Extensions.DataIngestion* projects to document their initial public-facing APIs. The CHANGELOGs follow the repository's established format and document all public APIs introduced in the 10.0.0-preview.1 release, with the core DataIngestion project also documenting the SectionChunker addition from 10.1.0-preview.1 (PR #7015).

Key changes:

• Documents public APIs for the DataIngestion abstractions, core implementations, and two reader packages
• Correctly excludes internal types like MarkdownParser and ElementsChunker from documentation
• Follows the repository's CHANGELOG format and conventions

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/Libraries/Microsoft.Extensions.DataIngestion/CHANGELOG.md	Documents core library APIs including pipeline, chunkers, enrichers, and vector store writer across two versions (10.0.0-preview.1 and 10.1.0-preview.1)
src/Libraries/Microsoft.Extensions.DataIngestion.Abstractions/CHANGELOG.md	Documents all abstraction types including IngestionDocument, IngestionChunk, base classes for chunkers/readers/processors/writers, and document element types
src/Libraries/Microsoft.Extensions.DataIngestion.MarkItDown/CHANGELOG.md	Documents MarkItDownReader and MarkItDownMcpReader classes for converting documents via MarkItDown tool and MCP server
src/Libraries/Microsoft.Extensions.DataIngestion.Markdig/CHANGELOG.md	Documents MarkdownReader class for reading markdown documents

[adamsitnik]

@copilot please apply my suggestions

[Copilot]

@copilot please apply my suggestions

Applied all suggestions - simplified to "Initial preview release" format (commit 4c94b4d)

[adamsitnik]

[adamsitnik]

Can you elaborate on why? This is a change log.

@stephentoub I've removed these descriptions. I was just not used to the concept of change log and tried to add part of the docs in the wrong place. PTAL