Wire up LTspice as a second simulation engine using mcltspice (Wine-based
LTspice runner). The backend architecture already had the ABC + factory
pattern; this connects the ltspice branch.
- Extract shared raw_to_waveform() into raw_convert.py with Protocol typing
so both ngspice and mcltspice RawFile objects work without coupling
- Add LtspiceEngine with deferred mcltspice import for graceful degradation
- Register "ltspice" in get_engine() with availability check
(mcltspice + Wine + LTspice.exe must all be present)
- Add startup validation log for LTspice availability
- Add mcltspice as optional dependency: pip install spicebook[ltspice]
- Integration tests auto-skip when LTspice is unavailable (Docker/CI)
- Mount FastMCP at /mcp with tools for notebook CRUD, simulation,
and cell execution. Includes status resource and circuit_assistant
prompt.
- Add SSE streaming chat endpoint at /api/chat/stream backed by
GPU LLM gateway (qwen3). Chat widget sends notebook context
(SPICE cells, markdown notes) so the assistant can reference the
user's circuit.
- React floating chat panel with zustand-persisted conversation
history, streaming token display, reasoning collapse, and
keyboard shortcuts.
- Refactor main.py from deprecated on_event("startup") to lifespan
context manager with combine_lifespans for MCP integration.
- Add notebook_id path traversal validation, decouple get_engine()
from HTTPException for MCP compatibility, fix HTTP client init
race condition with asyncio.Lock.
- Update Caddy labels for /mcp/* routing and SSE streaming on
backend reverse proxy.
Parse netlists into component graphs and render circuit diagrams via
SchemDraw. Two layout strategies: loop layout for simple 2-terminal
circuits (RC, RL, voltage divider) and labeled grid for complex
circuits with active devices (BJT amplifiers, MOSFET).
Backend: netlist parser, schematic engine, POST API endpoint.
Frontend: SchematicViewer with zoom/download, stacked cell layout
showing schematic + SPICE editor + waveform simultaneously.
