chore: resolve wasm tooling bundler CI, caching, and documentation issues

[anoncon]

Fix WASM Tooling Issues

This PR resolves multiple issues related to tooling/sanctifier-wasm, improving reliability, stability, and documentation.

Changes

1. Bundler Compatibility CI (tooling/sanctifier-wasm: Add integration/e2e coverage in CI (bundler compatibility (Vite/Next/Webpack)) #539): Added a new GitHub Actions workflow to run e2e bundler compatibility tests for Vite, Webpack, and Next.js.
2. Offline Caching Reliability (tooling/sanctifier-wasm: Release/publishing reliability improvements (caching of analysis artifacts in browser) #545): Added tests for asset_cache_key() and cache_metadata() to ensure deterministic offline-first usage. Documented caching behavior.
3. Web Worker Strategy (tooling/sanctifier-wasm: Improve UX/DX and defaults (web worker / parallelization strategy) #546): Added an example reference implementation for delegating analysis to a background worker to prevent UI blocking.
4. API Surface Stability (tooling/sanctifier-wasm: Document behavior + contribution notes (API surface stability for frontend) #542): Updated documentation with explicit guarantees regarding API stability for frontend consumers.

Closes #539
Closes #545
Closes #546
Closes #542

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