feat(slice-2e): v0.0.36 Slice 2e FULLY RESUELTO — Real WASM_BINARY 1.8 MB shipped (5 layers resolved end-to-end)

Slice 2e WASM structural blocker FULLY RESUELTO end-to-end. Real
origin_chain_runtime.wasm (1,795,946 bytes ~1.8 MB) shipped post-brew LLVM
install + 5 layers de blockers resolved. PHASE 3 + PHASE 4 Testnet Q3 2026
UNBLOCKED.

5-layer resolution:
- Layer 1 alloc/exchange_malloc → WASM_BUILD_STD=0
- Layer 2a getrandom 0.2 wasm → custom feature
- Layer 2b getrandom 0.3 backends → wasm_js feature
- Layer 3 secp256k1-sys clang wasm32 → brew LLVM + CC env vars
- Layer 4 sp-io std leak → default-features=false en path deps
- Layer 5 Vec no_std impl_opaque_keys → alloc::vec::Vec import

Changes:
- Cargo.toml workspace: path deps default-features=false + getrandom_02 + getrandom_03
- runtime/Cargo.toml: substrate-wasm-builder feature-gated + getrandom deps
- runtime/src/opaque.rs: extern crate alloc + use Vec import

Verification:
- WASM_BUILD_STD=0 + brew LLVM env vars + cargo build --features wasm-build → 3.36s clean
- origin_chain_runtime.wasm 1.8 MB shipped
- cargo test --workspace — 202 tests verde 0 failures NO regression

🎉 Slice 2e FULLY RESUELTO. La nave Origin Chain zarpando hacia Phase 3 + 4.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -637,6 +637,12 @@ dependencies = [
  "semver 0.6.0",
 ]
 
+[[package]]
+name = "bumpalo"
+version = "3.20.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72f5acc6cb2ba439de613abc23857ec3d78374d8ed5ac84e9d11336e87da8649"
+
 [[package]]
 name = "byte-slice-cast"
 version = "1.2.3"
@@ -1757,9 +1763,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
 dependencies = [
  "cfg-if",
+ "js-sys",
  "libc",
  "r-efi",
  "wasip2",
+ "wasm-bindgen",
 ]
 
 [[package]]
@@ -2036,6 +2044,17 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "js-sys"
+version = "0.3.99"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "142bc4740e452c1e57ade0cbc129f139c9093e354346f0872ef985f4f5cf5f11"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "k256"
 version = "0.13.4"
@@ -2520,6 +2539,7 @@ dependencies = [
  "frame-system",
  "frame-system-rpc-runtime-api",
  "getrandom 0.2.17",
+ "getrandom 0.3.4",
  "log",
  "origin-chain-agent-identity",
  "origin-chain-fees",
@@ -4757,6 +4777,51 @@ dependencies = [
  "wit-bindgen",
 ]
 
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.122"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3ed04576f974d2b2fba0f38c51dbc5518011e38c36bf1143164be765528fd409"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "rustversion",
+ "wasm-bindgen-macro",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.122"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "916151b09da36bd82f6615cbf3a419e2f0ba23a03c6160e8e92eb6bd4aa1dec6"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.122"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "299047362ccbfce148b67ab7e73349f77748e00c8296f9542adfad2ad82c5c5e"
+dependencies = [
+ "bumpalo",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.122"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a929b2c61f11ba3e9bc35b50c1f25cb38e0e892c0c231ae2b8cf78d5dad4437"
+dependencies = [
+ "unicode-ident",
+]
+
 [[package]]
 name = "wasm-opt"
 version = "0.116.1"