Add RK3326 bus and power-plane fanout

[seveibar]

Summary

• wrap the RK3326 in a native <breakout> component
• map DDR, eMMC, SDMMC, USB OTG, MIPI DSI, and MIPI CSI buses to stable handoff points
• route 154 ground balls to inner1
• route 51 power balls across 23 distinct rails to inner2
• reserve top, inner3, inner4, and bottom for signal fanout
• pin tscircuit to 0.0.2180 and extend tests and generated-circuit validation

Why

The RK3326 BGA needs deterministic supply-plane drops before expanding the signal fanout. This gives every supply ball a collision-free interstitial escape while preserving separate CPU, DDR, I/O, PLL, USB, MIPI, ADC, OTP, and PMU power nets.

Dependencies

• Add fanout pour net map props props#766
• Infer fanout plane drops from copper pours core#2929

This PR is draft until those plane-termination integration changes merge and are released.

Validation

• bun run typecheck
• bun test tests/rk3326.test.ts — 8 passed, 602 assertions
• npx tsci build index.circuit.tsx --all-images --ignore-warnings
• bun run validate:footprint
• generated circuit contains zero error records, 154 top→inner1 ground drops, and 51 top→inner2 power drops