chore: release 0.2.1

[eitsupi]

Summary

• Bump version to 0.2.1
• Update CHANGELOG.md
• Update README: source mode framing and MCP server documentation

Changes

Features

• Experimental MCP stdio server: new dlin mcp subcommand exposes project summary, model search, lineage, impact, and column lineage as MCP tools for use with AI assistants; requires --dialect and a manifest.json (feat(mcp): experimental MCP server #76)
• Improve manifest-mode cache behavior for column lineage to reduce unnecessary recomputation and speed up repeated analysis runs (perf: strengthen manifest-mode caching and column lineage invalidation #74)

Bug Fixes

• Fix stale cache invalidation paths in manifest mode so column lineage results are recomputed when manifest file state changes (perf: strengthen manifest-mode caching and column lineage invalidation #74)

[Copilot]

Pull request overview

Release chore bumping the workspace to 0.2.1, finalizing the changelog entry, and refreshing README to document the new source modes and experimental MCP server.

Changes:

• Bump version from 0.2.1-rc.1 to 0.2.1 in workspace and lockfile.
• Promote [0.2.1-rc.1] - 2026-05-31 to [0.2.1] - 2026-06-01 and add MCP server entry.
• Restructure README: new "Source modes" section, MCP server subsection under AI agent integration, and minor copyedits.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
Cargo.toml	Version bump to 0.2.1 (workspace + internal dlin-core dep).
Cargo.lock	Regenerated versions for dlin and dlin-core.
CHANGELOG.md	New 0.2.1 release entry with MCP feature note.
README.md	Reframes intro for dual source modes; adds Source modes and MCP server sections.

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