v0.12.0

• Added: baseUrl falls back to the MAILTEA_API_BASE_URL environment
  variable before defaulting to https://api.mailtea.app. Point a self-hosted
  or local instance at the SDK without threading an option through your code.
  An explicit baseUrl still wins. This closes a gap the other clients did not
  have — the Python SDK, the CLI and the MCP server have always read it.
• Fixed: the global fetch is now bound before it is stored, so the SDK works
  on Cloudflare Workers without a wrapper. The stored reference is called bare,
  which strips the global this; Node and browsers tolerate that, the Workers
  runtime answers TypeError: Illegal invocation. Workers users no longer need
  to pass fetch: globalThis.fetch.bind(globalThis). A fetch you supply is
  still used exactly as given.

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Released from mailtea-app/mailtea@a0172ed.