stagehand-python@4.2.0a0.dev1548: docs: Update Stagehand deployment docs with Functions support ( 3056)

Browserbase Stagehand releases published stagehand-python@4.2.0a0.dev1548: docs: Update Stagehand deployment docs with Functions support ( 3056). This automated release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: why The release of Function Secrets enables us to support Stagehand deployments on Browserbase. This PR showcases that in the new deployment guide what changed test plan Summary by cubic Updates the Stagehand deployment guide to recommend Browserbase Functions with encrypted project secrets as the primary deployment path instead of Vercel. Adds setup, extension upload, Function development, local testing, publishing, secret attachment, invocation, and troubleshooting steps. Uses the Model Gateway in the example, so no model provider setup is needed. Moves the Vercel guide under "Other deployment options" and adds a Features section. Clarifies the introduction's description of Stagehand's control layers. Written for commit 83c9e20 . Summary will update on new commits.

• Review the official Browserbase Stagehand releases release notes before upgrading.
• Check compatibility, migration, and security notes against your current agent stack.
• Run focused regression tests before production rollout.