docs: restore model cache release note history

[leehack]

Summary

• Restore the historical DefaultModelDownloadManager.auto(...) / explicit cache-root constructor release note to the 0.8.8 section.
• Keep the PR fix: use platform-appropriate model cache defaults #248 Unreleased notes focused on the actual new changes: platform default-path behavior and the Android/iOS-specific optional auto(...) arguments.
• Mirror the same correction in the website recent releases page.

Why

A late independent review of PR #248 correctly noticed that the existing 0.8.8 API-addition note had been moved into Unreleased. The merged PR already fixed runtime/docs behavior, but the release-note history should remain accurate.

Test Plan

• git diff --check
• npm ci && npm run build in website/

[Copilot]

Pull request overview

Restores accurate historical release-note placement for the DefaultModelDownloadManager.auto(...) / explicit cache-root constructor addition by moving it back into the 0.8.8 section, while keeping Unreleased focused on the newer platform-default-path behavior and the Android/iOS-specific optional auto(...) arguments. This keeps both the canonical changelog and the website “Recent Releases” page consistent and historically correct.

Changes:

• Move the historical “added DefaultModelDownloadManager.auto(...) + explicit cache-root constructors” note from Unreleased back to 0.8.8.
• Keep Unreleased notes centered on the newer optional androidAppPrivateCacheDirectory / iosAppPrivateCacheDirectory args and updated default cache behavior.
• Mirror the same fix in the website recent releases page.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
CHANGELOG.md	Restores the 0.8.8 historical note about DefaultModelDownloadManager.auto(...) / explicit cache-root constructors and keeps Unreleased focused on the newer cache-default changes.
website/docs/changelog/recent-releases.md	Mirrors the same 0.8.8 vs Unreleased release-note correction for the website’s Recent Releases page.

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