Alan-Jowett / sonde / 24376913885

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feat: add sonde-kicad crate + carrier board PCB (#704)

* feat: add sonde-kicad crate — IR-to-KiCad 8 export tool

Implements the core sonde-kicad crate per the spec trifecta
(kicad-export-requirements.md, kicad-export-design.md,
kicad-export-validation.md).

Completed modules:
- IR loading: deserializes IR-0 through IR-3 YAML files with schema
  version validation and cross-reference checking
- S-expression AST: serializer with indentation + parser for
  .kicad_mod and .ses files
- Deterministic UUID generator: SHA-256 seeded from project + IR hash
- Vendored symbol registry: Device:R, Device:C, Device:FerriteBead,
  Device:Q_PMOS_GSD, Connector_Generic:Conn_01x0{2,3,4,7}, power:GND
- Schematic generation: functional-group layout, wire/label
  connectivity, power symbols, no-connect markers, title block
- BOM CSV generation: JLCPCB-compatible format with LCSC part numbers
- CLI binary: schematic, bom, and build subcommands

Stub modules (for next phases):
- PCB generation (placement, footprints, zones, silkscreen)
- Specctra DSN export
- Freerouter SES import
- CPL CSV and Gerber export

Verified: builds, passes clippy with -D warnings, 13 unit tests pass,
generates valid .kicad_sch from carrier-board IR files.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* feat: implement PCB, DSN, SES, CPL, and Gerber modules

Complete the sonde-kicad crate implementation:

PCB generation (KE-0300 through KE-0310):
- Board outline on Edge.Cuts from IR-3 dimensions
- 2-layer and 4-layer stackup support
- Component placement from IR-3 connector positions and zones
- Net definitions from IR-2 with pad-to-net assignments
- Keep-out zones from IR-3
- GND copper pour on B.Cu
- Silkscreen labels from IR-3

Specctra DSN export (KE-0400 through KE-0405):
- Board boundary, layer defs, keep-outs, via padstack
- Component placement grouped by footprint
- Simplified pad images from pin count
- Network section with net classes (power/default)
- Design r... (continued)

1818 of 2686 new or added lines in 26 files covered. (67.68%)

23092 of 28755 relevant lines covered (80.31%)

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