docs(changelog): prepare v0.3.9 release

[xusd320]

Summary

• Prepare the changelog for the next stable 0.3 release, v0.3.9.
• Capture the single feature merged after v0.3.8.

Changes

• Leave the Unreleased section empty for future changes.
• Add a dated v0.3.9 section for the dev server ready plugin hook from feat(plugin): expose dev server ready hook #92.
• Keep source package versions and internal dependency ranges unchanged; release automation owns publish-time versioning.

Validation

• npm run lint
• npm --workspace evjs-docs run build
• git diff --check

Risk / rollout

• Low risk: this PR changes only release metadata in CHANGELOG.md.
• Publishing occurs separately when the v0.3.9 GitHub Release is created after merge.

Reviewer notes

• Verify the v0.3.9 entry matches the complete v0.3.8...main commit range.

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📥 Commits

Reviewing files that changed from the base of the PR and between 2670ad2 and d6cbbdc.

📒 Files selected for processing (1)

• CHANGELOG.md

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