Prepare llamadart 0.6.16 release

[leehack]

Summary

• Bump llamadart to 0.6.16 and align current install snippets plus the chat app path lockfile.
• Merge the latest main changes, including native getVramInfo() VRAM diagnostics, into the release branch.
• Move the accumulated release notes into a 0.6.16 changelog section with a compatibility note and no empty Unreleased section.
• Mirror the 0.6.16 highlights in the current docs recent releases page.

Validation

• dart format --output=none --set-exit-if-changed .
• dart analyze
• dart test -p vm -j 1 --exclude-tags local-only
• ./tool/docs/build_site.sh
• ./tool/docs/validate_links.sh
• flutter pub publish --dry-run (0 warnings)

[leehack]

@copilot review

[Copilot]

Pull request overview

This PR prepares the llamadart 0.6.16 release by updating package version metadata, install snippets, lockfile state, and release notes/docs.

Changes:

• Bumps the package and tracked chat app path lockfile from 0.6.15 to 0.6.16.
• Moves changelog content into a 0.6.16 section with a compatibility note.
• Adds matching 0.6.16 highlights to the current docs recent releases page.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pubspec.yaml	Updates the package version to 0.6.16.
README.md	Updates the install dependency snippet to ^0.6.16.
website/docs/getting-started/installation.md	Updates current docs install snippet to ^0.6.16.
CHANGELOG.md	Converts unreleased notes into the 0.6.16 release section.
website/docs/changelog/recent-releases.md	Adds current-docs release highlights for 0.6.16.
example/chat_app/pubspec.lock	Aligns the tracked path dependency version with the package version.

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[Copilot]

@copilot review

Reviewed the current PR state and reran automated validation for this branch; there are no additional issues to fix from my side at this point (latest commit: a540d84).

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.44%. Comparing base (63c3663) to head (52a640f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #166   +/-   ##
=======================================
  Coverage   78.44%   78.44%           
=======================================
  Files          76       76           
  Lines        9957     9957           
=======================================
  Hits         7811     7811           
  Misses       2146     2146           

Flag	Coverage Δ
unittests	78.44% <ø> (ø)

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[leehack]

@copilot review

[Copilot]

@copilot review

Completed another review pass on the current branch state; I did not find additional fixes to apply at this point (latest commit: 52a640f).