v0.12.1

Changed

• Widen the pydantic-ai-slim dependency constraint from >=1.0,<2 to
  >=1.0,<3 (core plus the anthropic / openai / google provider extras),
  so the package installs against Pydantic-AI 2.x. Verified against
  pydantic-ai-slim 2.6.0. The 1.x line remains supported.
• Widen the [spec-tools] extra's djangorestframework-pydantic-ai pin to
  >=0.2,<0.4 (was <0.3 — stale; the backing package is at 0.3.x) and the
  [drf-mcp] extra's djangorestframework-mcp-server pin to >=0.9,<0.12
  (was <0.11). Together these let a project resolve pydantic-ai-slim 2.x
  through the optional bridges without back-tracking to the 1.x line.

Notes on Pydantic-AI 2.x

build_model delegates provider-prefix → model-class resolution to Pydantic-AI
(there is no hand-maintained table), so it inherits these 2.x vocabulary
changes for projects that install pydantic-ai-slim>=2:

• The bare openai: prefix now builds an OpenAIResponsesModel (the Responses
  API) rather than an OpenAIChatModel. Use openai-chat: for the Chat
  Completions model.
• Bare model names no longer infer a provider — claude-sonnet-4-5 (no
  provider: prefix) previously resolved to Anthropic; it now raises
  ImproperlyConfigured pointing at the PROVIDER setting. Pass an explicit
  provider:name string.
• The google-gla: and google-vertex: provider prefixes were removed
  upstream; only google: remains (our gemini: → google: alias is
  unaffected).