chore(release): prepare 0.8.11

[leehack]

Summary

• prepare llamadart 0.8.11 from the merged native b9829 sync
• bump llamadart_llama_cpp_flutter to 0.0.7 and move its native pin note out of Unreleased
• keep llamadart_litert_lm_flutter at 0.0.2 while updating current docs snippets to the core release version
• update current README/website install snippets and recent release notes
• document that native sync records companion native pin changes under Unreleased, while release-prep performs explicit companion version bumps

Local validation

• dart pub get
• dart format --output=none --set-exit-if-changed .
• dart run tool/testing/verify_release_docs_versions.dart
• dart test test/unit/tooling/release_install_snippets_test.dart
• dart test test/unit/tooling/sync_native_release_pins_script_test.dart
• git diff --check
• dart analyze lib test tool (passes with 3 existing info-level lints)
• dart pub publish --dry-run (0 warnings)
• flutter pub publish --dry-run in packages/llamadart_llama_cpp_flutter (0 warnings)
• flutter pub publish --dry-run in packages/llamadart_litert_lm_flutter (0 warnings)
• ./tool/docs/build_site.sh

Release notes

• Do not publish/tag from this PR directly. After merge, publish the changed companion package tag first (llamadart_llama_cpp_flutter-v0.0.7), verify pub.dev, then tag the core v0.8.11 release with separate maintainer approval.

[github-actions]

Chat app preview removed for leehack/llamadart-chat-pr-253.

[Copilot]

Pull request overview

Prepares the llamadart 0.8.11 release by bumping package versions and aligning “current” install documentation and recent release notes with the new core + companion versions, while documenting the intended companion-version bump workflow during release prep.

Changes:

• Bump core package version to 0.8.11 and convert root CHANGELOG.md from Unreleased to the 0.8.11 release section.
• Bump llamadart_llama_cpp_flutter to 0.0.7, moving its native pin note into a versioned changelog entry, and update companion install snippets accordingly.
• Update README + website install docs and recent release notes to reference ^0.8.11 / ^0.0.7, and clarify maintainer guidance around companion pin notes vs version bumps.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
website/docs/maintainers/release-workflow.md	Clarifies that native pin sync records companion pin changes under Unreleased, while release-prep performs explicit companion version bumps as needed.
website/docs/getting-started/installation.md	Updates install snippets to llamadart: ^0.8.11 and llamadart_llama_cpp_flutter: ^0.0.7.
website/docs/changelog/recent-releases.md	Adds a new 0.8.11 “recent release” entry aligned with the release-prep notes.
README.md	Updates “current” dependency snippets to ^0.8.11 / ^0.0.7.
pubspec.yaml	Bumps core package version to 0.8.11.
packages/llamadart_llama_cpp_flutter/README.md	Updates companion install snippet to ^0.8.11 / ^0.0.7.
packages/llamadart_llama_cpp_flutter/pubspec.yaml	Bumps companion version to 0.0.7.
packages/llamadart_llama_cpp_flutter/CHANGELOG.md	Moves the prior “Unreleased” entry into a 0.0.7 section.
packages/llamadart_litert_lm_flutter/README.md	Updates core dependency snippet to ^0.8.11 while keeping the companion at ^0.0.2.
CHANGELOG.md	Publishes the accumulated notes under ## 0.8.11 and aligns wording with the release.

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