RFC: Funding executable type in the product manifest

Source PR: #458 · docs/rfcs/product-manifest.md · @BigTava

Description

The product manifest gains a fourth executable type, funding, published at funding.<product_id>.<tld> and backing the Funding modality.

Motivation

The Host builds its funding source list from dotNS records alone, before any provider code runs, and the v1 executable set has nowhere to declare that surface.

Requirements

• Executable types become App, Widget, Funding, Worker.
• FundingManifest = { kind: "funding"; modes: FundingMode[] }, with modes non-empty.
• FundingMode is "CARD" | "BANK" | "CRYPTO".
• Bytes are located by the subname's contenthash, as for every executable.

Tasks

• RFC document body
• Implementation — rust-core
• Implementation — hosts
  • dotli
  • Desktop
  • iOS
  • Android
  • host-cli