Add Satoshi API fee agent template

[Bortlesboat]

Summary

• add a TypeScript Satoshi API fee-agent template
• fetch the free Satoshi API /api/v1/fees/recommended endpoint before opening a Browserbase Stagehand session
• document /api/v1/fees/now as the optional x402 paid first-call route
• add the template to the README index so it can flow into browserbase.com/templates if accepted
• related package path: companion community integration example Add Satoshi API community example integrations#74

Reviewer Packet

• public packet: https://gist.github.com/Bortlesboat/41f694ec0d1bb6f01940305d004066b5
• integration intro draft: https://gist.github.com/Bortlesboat/41f694ec0d1bb6f01940305d004066b5#file-introduction-md
• quickstart draft: https://gist.github.com/Bortlesboat/41f694ec0d1bb6f01940305d004066b5#file-quickstart-md
• TypeScript example: https://gist.github.com/Bortlesboat/41f694ec0d1bb6f01940305d004066b5#file-index-ts
• optional Browse.sh skill draft: https://gist.github.com/Bortlesboat/41f694ec0d1bb6f01940305d004066b5#file-browse-sh-skill-md

Verification

• corepack pnpm run check:readme-template-index
• corepack pnpm run build (from typescript/satoshi-api-fee-agent)
• corepack pnpm exec eslint typescript/satoshi-api-fee-agent/index.ts
• corepack pnpm exec prettier --check README.md typescript/satoshi-api-fee-agent/README.md typescript/satoshi-api-fee-agent/index.ts typescript/satoshi-api-fee-agent/package.json typescript/satoshi-api-fee-agent/tsconfig.json
• curl.exe -i https://bitcoinsapi.com/api/v1/fees/recommended returned HTTP 200

Notes

Repo-wide lint currently exits 0 with two existing warnings outside this template. Repo-wide format:check reports existing formatting warnings across many files on dev, so I verified Prettier on the touched files directly.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[Bortlesboat]

Related context for reviewers: I also submitted the Browserbase partner/integration form with the public reviewer packet, and opened the companion community integration example in browserbase/integrations#74. This PR is the Browserbase templates path for the same Satoshi API fee-intelligence workflow.

[Bortlesboat]

Addressed the Bugbot estimate-key concern in 3854b3a: the template now supports both numeric confirmation-target keys (the live /api/v1/fees/recommended response currently returns 1/3/6/25/144) and high/medium/low-style fallbacks, plus common top-level fee key variants. Re-ran template build, targeted ESLint, changed-file Prettier, and a live HTTP 200 check against the free fee endpoint.