Improve decoupling capacitor group layout

[b3417]

/claim #15

Summary

• Adds a specialized final layout pass for identified decoupling capacitor groups.
• Places each capacitor group in a side column next to its main chip, ordered by the strongly-connected main-chip pins.
• Shifts each decap column outward when needed to avoid overlaps with non-group components.
• Adds a LayoutPipelineSolver06 regression test for compact side-column decoupling capacitor placement.

Verification

• bun test tests\\LayoutPipelineSolver\\LayoutPipelineSolverDecouplingCaps.test.ts
• bun test
• bun run build

Note: bun run format:check still reports pre-existing repository-wide CRLF formatting differences; the two changed files were formatted with Biome.

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