v0.13.0

• Pair this release with Apple companions llamadart_llama_cpp_flutter,
  llamadart_litert_lm_flutter and llamadart_stable_diffusion_flutter
0.13.0, which link native runtimes v0.6.0-3, v0.18.0-1 and v0.2.0-3,
  respectively.

• Behavior change: Apple companion versions now share the core
  MAJOR.MINOR, starting at 0.13.0, with independent patch versions. Each
  companion depends on llamadart within its core minor
  ('>=0.13.0 <0.14.0'), so pub refuses a mismatched companion and core
  instead of the iOS or macOS build failing, and the Apple build error or
  warning for a mismatched or older llama.cpp companion names that minor,
  such as ^0.13.0. Apps that take llamadart from a path or git checkout
  add it under dependency_overrides
  (#857).

• Behavior change: LiteRT-LM caps each cache directory's GPU program cache
  files at 1 GiB by default
  (ModelParams.defaultLiteRtLmMaxProgramCacheBytes), pruning least recently
  modified files first before each engine create, so an existing oversized
  cache is pruned on the first create after upgrading. An explicit
  liteRtLmMaxProgramCacheBytes now bounds the directory total instead of
  each file; pass ModelParams.unlimitedLiteRtLmProgramCacheBytes (-1) to
  keep every file. Engines sharing a cache directory no longer delete the
  program caches of a model another one is running, and
  liteRtLmCacheDir: ':nocache' no longer creates a directory, which failed
  the load on Windows (#552).

• Add ToolDefinition.fromJsonSchema for owned, validated tool input schemas,
  with explicit errors for unsupported constraints, formats and runtimes
  (#1007).

• Behavior change: ToolParam tool grammars are stricter: GLM-4.5, Laguna
  and Hunyuan V3 integer parameters reject fractions, ToolParam.nullType
  accepts only null, and Gemma 2/3 multi-tool grammars require the
  {"tool_call": ...} wrapper. Open JSON Schema objects, including
  responseFormat schemas, no longer accept a declared property through the
  extra-property slot unless the declared names exceed the grammar size budget.

• Behavior change: a ToolChoice.required reply cut short by a cancel or
  maxTokens ends with stop or length and no tool calls instead of
  throwing StateError; other output a PEG parser cannot parse, including in
  ChatTemplateEngine.parse, throws LlamaInferenceException
  (#890).

• Behavior change: on native llama.cpp, a runtime missing an mtmd function,
  with no complete fallback mtmd library, fails image and audio requests, and
  supportsVision, with LlamaUnsupportedException naming the function and
  pinned runtime
  (#640).

• Behavior change: on Web, SpeechToTextEngine.load,
  TextToSpeechEngine.load and LlamaEngine.setModel with a projector report
  progress from 0 to 1, as DecisionEngine.load does
  (#903).

• On macOS x86_64, LiteRT-LM GPU requests fail up front with
  LlamaUnsupportedException, and LiteRT-LM is no longer reported or selected
  as GPU there (#711).

• With llamadart_litert_lm_flutter 0.0.15, the macOS build only warns to
  upgrade the companion instead of claiming the app needs the LiteRT-LM build
  phase (#1064).

• WebGpuLlamaBackend(bridgeScriptUrl: ...) loads the bridge in dart2js
  builds (#735).

• The image model memory check treats a GPU reporting 0 bytes free, as Vulkan
  does over budget, as having no free GPU memory: loads warn and, on Linux,
  are refused above system memory
  (#980).

• LlamaEngine.getPerformanceContext() returns null after a generation
  cancelled before it reached the backend, instead of the previous request's
  counters (#677).

• Clearer errors: a chat template that fails to render names its source
  (#820), a
  SpeechToTextEngine attached to a disposed LlamaEngine reports the
  disposal (#924), and an
  ImageGenerationEngine.load SHA-256 mismatch names the main file by
  position, not its path or URL
  (#907).

• Aligned the default WebGPU bridge assets to v0.1.59, unchanged from 0.12.2:
  they embed llama.cpp v0.6.0, are qualified against native v0.6.0, and
  keep Web/native llama.cpp v0.6.0@d81235049384534c167caea52b85a694f6103d14
  parity; Web LiteRT-LM is @litert-lm/core@0.18.0. Immutable Web asset
  manifest:
  f823b10417b212ff1f66aa1c46bf78af7d9c393497dfcf0fa3a4f77adeb260eb.