v0.9.4: Anthropic reasoning capture

[0.9.4] — 2026-08-26

An Anthropic interoperability release for Forge Proxy and direct Anthropic
client usage. Native plaintext thinking returned alongside tool calls now
participates in Forge's existing reasoning-replay policy.

Added

• Anthropic tool-call reasoning is captured consistently. Streamed and
  non-streamed native thinking content is mapped to ToolCall.reasoning,
  preferred over the existing visible-text fallback, and exposed through
  Forge Proxy's OpenAI-compatible responses according to the configured
  replay policy. Text-only responses remain visible text, and native signed
  thinking-block round-tripping remains outside this release's scope. #152