Prepare 0.8.3 release

[leehack]

Summary

• Bump the core llamadart package version to 0.8.3.
• Move the Windows CUDA backend discovery fix from Unreleased into the 0.8.3 changelog section.
• Update current install snippets and recent-release docs to use ^0.8.3.

Release Scope

• Patch release for the Windows CUDA native-asset backend loading fix from fix: load Windows backend modules with altered search path #227.
• No native runtime pin changes.
• No companion package version changes.

Release Gate Evidence

• Latest pub.dev core version check: llamadart latest is 0.8.2, so 0.8.3 is the next patch release.
• release-companion-pub-gate: verified llamadart_llama_cpp_flutter 0.0.3 and llamadart_litert_lm_flutter 0.0.2 exist on pub.dev before the core tag.
• release-representative-smokes: runtime behavior covered by fix: load Windows backend modules with altered search path #227 validation; the RTX 5050 Windows CUDA smoke loaded ggml-cuda.dll from .dart_tool/lib with the native bundle directory not on PATH and enumerated the GPU successfully.

Validation

• dart run tool/testing/test_matrix.dart --tier release
• dart format --output=none --set-exit-if-changed .
• dart analyze
• dart test - 1817 passed, 6 skipped
• ./tool/docs/build_site.sh
• ./tool/docs/validate_links.sh
• dart pub publish --dry-run - 0 warnings

[Copilot]

Pull request overview

Prepares the llamadart repository for the 0.8.3 patch release by bumping the package version and updating release notes + install snippets to reflect ^0.8.3, with the release notes focused on the Windows CUDA backend discovery fix from #227.

Changes:

• Bumped core package version to 0.8.3.
• Promoted the Windows CUDA backend discovery fix into the 0.8.3 changelog/recent-releases sections.
• Updated “getting started” install snippets (root + website + companion-package READMEs) to reference llamadart: ^0.8.3.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pubspec.yaml	Bumps core package version to 0.8.3.
CHANGELOG.md	Creates the 0.8.3 section and records the Windows CUDA discovery fix.
website/docs/changelog/recent-releases.md	Adds 0.8.3 highlights for docs site “Recent Releases”.
README.md	Updates install snippets to llamadart: ^0.8.3.
website/docs/getting-started/installation.md	Updates install snippets to llamadart: ^0.8.3.
packages/llamadart_llama_cpp_flutter/README.md	Updates core dependency snippet to ^0.8.3.
packages/llamadart_litert_lm_flutter/README.md	Updates core dependency snippet to ^0.8.3.

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[github-actions]

Chat app preview removed for leehack/llamadart-chat-pr-228.