feat: default breakout autorouter to fanout

[seveibar]

Summary

• make the autorouter contract explicit on BreakoutProps
• default the shared breakout/fanout schema to autorouter="fanout"
• preserve explicit autorouter overrides such as single_layer_fanout
• update generated component documentation

<breakout> and <fanout> both use BreakoutProps, so this establishes the default once at the props boundary instead of duplicating it in core.

Validation

• bun test — 388 passing, 0 failing
• bunx tsc --noEmit
• bun run build
• git diff --check
• all GitHub test, type-check, and format checks passing

[graphite-app]

A *.test.ts file may have AT MOST one test(...) call. After this modification, breakout.test.ts contains at least two test(...) blocks (the pre-existing ones plus the newly added "breakout and fanout elements default to the fanout autorouter" test). The file should be split into multiple numbered files, e.g. breakout1.test.ts, breakout2.test.ts, breakout3.test.ts, with each file containing exactly one test(...).

Spotted by Graphite (based on custom rule: Custom rule)



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[tscircuitbot]

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PR Rating: ⭐⭐
Impact: Minor

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