Feat/wasm version

[rmn-boiko]

PR: WASM SDK implementation + parity/runtime refactor + CI integration

Overview

This branch introduces a full WASM SDK track for rgb-lightning-node, including runtime-backed endpoint behavior, wasm-focused architecture boundaries, contract coverage, examples, and CI integration.

Main changes

1) WASM SDK package and runtime

• Added/expanded bindings/wasm-sdk as the standalone wasm-facing SDK package.
• Implemented node/wallet/sdk façade surfaces and wasm runtime components:
  • LN runtime/event application
  • swap runtime
  • transport/session runtime
  • runtime state store + persistence hooks
• Added dedicated test modules for runtime behavior and SDK contracts.

2) SDK-level refactor in core crate

• Introduced SDK runtime abstraction layer in src/sdk/runtime.rs:
  • peer connectivity
  • channel peer store
  • LDK lifecycle
  • scheduler traits
• Continued migration of SDK logic to SDK layer (src/sdk/*) to reduce coupling to route handlers and keep behavior portable across native/wasm surfaces.
• Added wasm SDK boundary/bindings in core SDK path:
  • src/sdk/wasm.rs
  • src/sdk/wasm_bindings.rs

3) Build/target shaping for wasm

• Updated target-aware dependency layout in root Cargo.toml:
  • native-only deps behind cfg(not(target_arch = "wasm32"))
  • wasm deps behind cfg(target_arch = "wasm32")
• Updated src/lib.rs / src/main.rs target gating to keep native daemon path and wasm path cleanly separated.

4) Endpoint parity and contracts

• Expanded runtime-backed endpoint implementation coverage in wasm SDK.
• Added/maintained parity matrix and explicit error contract docs:
  • bindings/wasm-sdk/SDK_WASM_ENDPOINT_MATRIX.md
  • bindings/wasm-sdk/ERROR_CONTRACT.md
• Documented explicit unsupported-by-design area:
  • issue_asset_uda (for now)

5) Examples

• Added/updated browser interop/manual flow examples:
  • bindings/wasm-sdk/examples/wasm-interop/*
• Added wasm flow equivalents to mirror SDK usage patterns from existing Python interop references.

6) CI

• Added wasm checks to test workflow (.github/workflows/test.yaml):
  • wasm-sdk (crate check + test compile)
  • wasm-sdk-wasm32 (wasm32 target check)

Current status

• bindings/wasm-sdk builds successfully for:
  • host check
  • wasm32-unknown-unknown check
• CI now includes wasm pipeline coverage.
• Remaining unsupported/modeled gaps are explicitly documented in endpoint/error docs.