Draft changelog: XDKs refreshed to latest X API v2 spec (Jul 6)

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Summary

Adds a Jul 6, 2026 changelog entry noting the Python and TypeScript XDKs have been refreshed against the latest X API v2 OpenAPI spec.

Changes

• New <Update> block for Jul 6, 2026 in changelog.mdx
• Highlights refreshed SDK coverage for recent additions: Articles draft/publish and post.create / post.delete X Activity events
• Includes install-upgrade commands for both SDKs

Context

Triggered by the merge that regenerated docs from the latest OpenAPI spec (commit 541ef71). No other product-facing PRs shipped since the Jun 11 entry, so the note is scoped to the SDK refresh developers will notice when upgrading.

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Project	Status	Preview	Updated (UTC)
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