feat: add DC operating-point simulations

[ShiboSoftwareDev]

Summary

Completes first-class DC operating-point simulation in @tscircuit/core.

• adds simulationType="spice_dc_operating_point" and wall-clock timeout handling to <analogsimulation />
• emits scalar voltage/current operating-point results and associates them with voltage probes/ammeters
• adds <chip simulationBoundary /> so proprietary or out-of-scope ICs can intentionally terminate the analog model
• requires unmodeled, non-boundary chips to produce a classified missing_model error
• converts converter/engine failures into simulation_experiment_error records instead of aborting the render
• classifies missing engines, unsupported built-in-engine analyses, timeouts, invalid netlists, non-convergence, and generic engine errors
• preserves transient analysis defaults and existing delayed pulse injection (pulseDelay, rise/fall time, pulse width)
• updates existing virtual-power-chip fixtures to declare their simulation boundary explicitly

The end-to-end test runs ngspice on a 5 V divider and verifies 5 V at VIN, 2.5 V at VOUT, and 2.5 mA through an ammeter. It includes a combined schematic/operating-point SVG snapshot.

Tests

• bunx tsc --noEmit
• bun run build
• changed-file Biome check
• focused simulation regression set: 6 passed
• complete tests/features/spice-analysis run: 29 passed, 1 unrelated visual snapshot mismatch

The remaining visual mismatch is spice-analysis01-platform-config: its transient-result assertion passes, but the legacy schematic snapshot differs after the test emits its existing capacity-autorouter Unexpected numItems value: 0 error. This PR does not change that transient rendering path, so the unrelated snapshot was not refreshed.

Stack and merge order

1. Schema/result contract: add operating-point simulation result schema circuit-json#646
2. Public props: Add operating-point simulation props props#730
3. .op netlist generation: Generate DC operating-point SPICE analyses circuit-json-to-spice#50
4. ngspice execution/result conversion: Return scalar ngspice operating points ngspice-spice-engine#25
5. SVG results and diagnostics: feat: render DC operating-point simulation results circuit-to-svg#622
6. Core integration (this PR): feat: add DC operating-point simulations #2682

This draft intentionally targets the next package releases from the preceding PRs:

• circuit-json@^0.0.449
• @tscircuit/props@^0.0.578
• circuit-json-to-spice@^0.0.45
• @tscircuit/ngspice-spice-engine@^0.0.20
• circuit-to-svg@^0.0.388

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Project	Deployment	Actions	Updated (UTC)
tscircuit-core-benchmarks	Error		Jul 14, 2026 6:24pm

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