WASM SIMD view-tag scanner

[truthixify]

Tier: L (5-7 days) | Type: perf

Context. WebGPU (Wave 7 #1) targets browser GPU. Node servers and older browsers get no benefit. A WASM SIMD implementation of the view-tag inner loop runs everywhere Node and modern browsers ship, and closes the gap between the CPU-JS baseline (already 229x from view-tag batching) and the GPU path. Complementary to WebGPU, not competing.

Scope.

• Rust or AssemblyScript inner loop under src/chains/stellar/scanner/wasm/ compiled to .wasm with SIMD128 features.
• JS wrapper feature-detects WebAssembly.SIMD and falls back to the pure-JS batch path.
• Public API unchanged (fetchAnnouncementsStream).
• Bench in test/chains/stellar/bench/scan.bench.ts adds a WASM row.

Acceptance.

• Bench shows >= 2x speedup vs CPU-JS on 10k events in Node 20
• Same speedup verified in a headless Chrome Playwright run
• Fallback path taken (verified by test) when SIMD is unavailable
• .wasm byte size <= 32 KB, checked in size-limit

Files. src/chains/stellar/scanner/wasm/ (new), src/chains/stellar/scanner/index.ts, src/chains/stellar/announcements.ts, test/chains/stellar/bench/scan.bench.ts, package.json.

[kodinaka30-ship-it]

@kodinaka30-ship-it has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello maintainer, kindly review my application and assign this issue to me.
I’ll add a SIMD128 WASM scanner with feature detection and preserve the existing JS fallback/API.
I’ll benchmark Node and Chrome performance and enforce the 32 KB WASM limit.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @kodinaka30-ship-it to this issue.

[Good-terminal]

@Good-terminal has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer I will like to work on this issue please

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Good-terminal to this issue.

[MrOmale]

@MrOmale has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer, I'd love to work on this issue please. I deliver high impact solutions, ensuring seamless workflow and client satisfaction

ℹ️ Repo Maintainers: To accept this application, review their application or assign @MrOmale to this issue.

[fwseyi]

@fwseyi has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi i'd like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @fwseyi to this issue.

[xtrial01]

@xtrial01 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, i can work on this issue
Kindly assign me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @xtrial01 to this issue.

[Onlyabdull]

@Onlyabdull has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer can I get on this issue for you real quick? as it aligns with the issue I solved earlier I will like to help out on this one too.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Onlyabdull to this issue.

[Onyii1234]

@Onyii1234 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hi maintainer i will like to work on this issue please

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Onyii1234 to this issue.

[Muhd010]

@Muhd010 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, I’ve reviewed the issue details and am confident I can deliver a clean, efficient solution. Please assign it to me!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Muhd010 to this issue.