Prepare 0.8.20 release

[leehack]

Summary

• Prepare llamadart 0.8.20, llamadart_llama_cpp_flutter 0.0.14, and llamadart_litert_lm_flutter 0.0.10.
• Finalize concise user-facing release notes and update current installation snippets.
• Refresh the chat-app path dependency lock entries for the three release versions.
• Support both code_assets 1.x and 2.x so current consumers retain compatibility and pub.dev resolves the latest supported toolchain.

Opening this PR does not publish packages or create tags. Merging the release-prep branch is the guarded publication boundary handled by release_on_prep_merge.yml.

Production-readiness scope

• User-facing scope: Version and document the runtime, WebGPU, speech, chat-app, and companion-package work already merged since 0.8.19; keep native-asset hooks compatible with code_assets 1.x and 2.x.
• Supported platforms/paths: Release metadata, README and website install snippets, root and companion changelogs, the chat-app path lockfile, and the code_assets dependency constraint.
• Unsupported or intentionally unavailable paths: N/A; no implementation source or public API changes in this prep PR.
• Out of scope / follow-ups: Draft PR Add selectable Windows CUDA release sidecars #340 (selectable Windows CUDA release sidecars) is not included in 0.8.20.

Completeness checklist

• Declared scope is fully implemented, or explicitly reduced above.
• Unsupported platform/option combinations fail loudly with actionable diagnostics or are clearly documented as unavailable.
• Public API docs, README/website docs, examples, support matrices, and changelog entries are updated where relevant.
• Regression coverage covers the original issue plus key negative/version-skew paths where relevant.
• Security/privacy review completed: no secrets, bearer tokens, signed URLs, or raw secret-bearing paths leak through logs, cache keys, metadata, errors, or snapshots.
• Follow-up work that is useful but not required for this PR is tracked in GitHub Issues, or explicitly marked "None" above.

PR type guidance

• Release-prep/dependency/docs PR: No implementation or public API changes. The exact merged runtime head was already validated across Web, macOS, Pixel, and physical iPad in Update native and Web llama.cpp pins to b10514 #342. The widened code_assets constraint is validated at both major-version bounds.

Test Plan

• dart format --output=none --set-exit-if-changed . — no changed Dart sources; the full command reports four pre-existing formatter deltas under the newer local SDK. Pana's packaged-source formatting gate passed.
• dart analyze
• dart test -p vm -j 1 --exclude-tags local-only — 1,411 passed, 66 skipped.
• dart test -p chrome --exclude-tags local-only — 766 passed, 1 existing skip.
• flutter test in example/chat_app — 336 passed.
• Both companion packages: format, analyze, Flutter tests, and SwiftPM dump-package.
• dart test test/unit/hook -j 1 with Dart 3.13.1 + code_assets 2.0.0 — 77 passed.
• Exact pub.dev toolchain: Dart 3.13.1 + Pana 0.23.18 — 160/160, including 50/50 static analysis and 40/40 dependencies.
• Pana lower-bound analysis with code_assets 1.0.0 — PASS.
• dart run tool/testing/check_platform_boundaries.dart
• dart run tool/testing/verify_release_docs_versions.dart
• ./tool/docs/build_site.sh
• ./tool/docs/validate_links.sh
• Root and both companion flutter pub publish --dry-run from clean temporary copies — 0 warnings.
• git diff --check

Matrix Evidence

Matrix row	Scope covered	Platform / model / backend	Result	Evidence / notes
Release metadata	Version/doc consistency	Core 0.8.20; companions 0.0.14 and 0.0.10	PASS	Release verifier and clean publish dry-runs passed.
Native-assets dependency	code_assets compatibility	1.0.0 lower bound and 2.0.0 latest	PASS	Pana lower-bound analysis passed; 77 hook tests passed on 2.0.0.
Root regression	Core Dart behavior	VM	PASS	1,411 passed, 66 skipped.
Browser regression	Web-facing Dart behavior	Chrome	PASS	766 passed, 1 existing skip.
Chat-app regression	Release lock compatibility	Flutter host tests	PASS	336 passed.
Package quality	pub.dev readiness	Dart 3.13.1 / Pana 0.23.18	PASS	160/160; dartdoc had 0 warnings/errors.
Runtime/device matrix	Already-merged runtime behavior	Web, macOS, Pixel, physical iPad; Qwen 3.5, Gemma 4, Qwen3-ASR/TTS	N/A for this prep commit	Exact runtime head evidence is recorded in #342; no runtime implementation file changed here.

Review Notes

• Independent review status: Three parallel scope, release-note, and validation audits found no release blocker on the initial prep head; dependency follow-up is independently covered by exact hosted-toolchain and focused hook evidence.
• CI status / head SHA: 14/14 checks green on 0d0d1a28ca78dcc0dd59c6dcb38d1ae7025f3354; mergeable/CLEAN; 0 review threads.

[github-actions]

Chat app preview removed for leehack/llamadart-chat-pr-343.

[Copilot]

Pull request overview

Prepares the llamadart 0.8.20 release (plus companion package bumps) by updating package versions and aligning user-facing installation snippets and release notes across the README, website docs, companion package docs, and the chat-app path lockfile.

Changes:

• Bumped core and companion package versions (llamadart 0.8.20, llamadart_llama_cpp_flutter 0.0.14, llamadart_litert_lm_flutter 0.0.10).
• Updated install snippets in README and website installation docs to reference the new versions.
• Finalized 0.8.20 release notes in changelogs and refreshed example/chat_app path dependency lock versions.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pubspec.yaml	Bumps core package version to 0.8.20.
CHANGELOG.md	Finalizes release notes under ## 0.8.20.
README.md	Updates installation snippets to ^0.8.20 / new companion versions.
website/docs/getting-started/installation.md	Updates website installation snippets for 0.8.20 and companion versions.
website/docs/changelog/recent-releases.md	Promotes release highlights to ## 0.8.20 and refines bullets.
packages/llamadart_llama_cpp_flutter/pubspec.yaml	Bumps companion version to 0.0.14.
packages/llamadart_llama_cpp_flutter/README.md	Updates companion install snippet to ^0.0.14 (and core to ^0.8.20).
packages/llamadart_llama_cpp_flutter/CHANGELOG.md	Finalizes companion release notes under ## 0.0.14.
packages/llamadart_litert_lm_flutter/pubspec.yaml	Bumps companion version to 0.0.10.
packages/llamadart_litert_lm_flutter/README.md	Updates companion install snippet to ^0.0.10 (and core to ^0.8.20).
packages/llamadart_litert_lm_flutter/CHANGELOG.md	Finalizes companion release notes under ## 0.0.10.
example/chat_app/pubspec.lock	Updates path-locked versions to match the new release versions.

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[Copilot]

Pull request overview

Copilot reviewed 11 out of 12 changed files in this pull request and generated no new comments.