Package the eecircuit runtime with the ngspice engine

[ShiboSoftwareDev]

What changed

• declare @tscircuit/eecircuit-engine 1.7.6 as a runtime dependency
• import the installed package instead of fetching and evaluating its CDN bundle
• verify a transient simulation completes while HTTP(S) fetches are blocked

Why

The ngspice engine previously needed network access on first use and evaluated the downloaded module through a Blob URL. Packaging the engine makes simulations deterministic and available in Node without a runtime CDN request. The eecircuit package already embeds its WASM binary.

Validation

• bun test — 44 pass
• bun run typecheck
• bun run build
• bun run format:check
• bun run lint
• TPS63802 Figure 10-26 completed in the TI repository with external network access unavailable