Introduce the multi-file FastMCP layout. The mcp instance moves to _app.py
(imports nothing from tool modules, keeping the registration graph acyclic),
and the self-contained SpiceBook domain (5 tools + status resource + publish
prompt + 2 helpers) moves to spicebook_tools.py. server.py imports it for the
registration side effect.
Tool/resource/prompt counts unchanged (42/6/8); names identical. Repointed
test_spicebook's _read_netlist import. server.py: 2472 -> 2168 lines.
Bridge mcltspice to SpiceBook (spicebook.warehack.ing) with 5 new MCP
tools (publish, list, get, delete, simulate), a status resource, and a
guided publish prompt. Includes LTspice-to-ngspice netlist conversion
(strips .backanno, Rser=, Windows paths) with structured warnings.
Path traversal protection on file reads (extension allowlist + resolve),
notebook ID validation, narrowed exception handling, and size limits.
35 unit tests + 4 live integration tests.
