FDR: expose dodder and madder as WASM modules

[friedenberg]

Create an FDR for compiling dodder and madder to WebAssembly to enable frontend interactions with repos.

Motivation

Enable browser-based UIs to interact with dodder repos directly, without requiring a server-side dodder process.

Key use case

Host packfiles in S3/B2 buckets and have the frontend pull objects lazily from them — no dedicated server needed, just static object storage behind a CDN.

Scope

• WASM build targets for dodder and madder core libraries
• JavaScript/TypeScript bindings for object reading, query, and blob retrieval
• Lazy object fetching from remote packfiles (HTTP range requests or similar)
• Integration with blob store abstractions (S3, Backblaze B2, etc.)

Substantial enough for an FDR.