feat: specialized linear layout for decoupling capacitor partitions

[huangyebiaoke]

Summary

/claim #15

Replaces the generic PackSolver2 with a dedicated horizontal row layout for partitions of type decoupling_caps, matching the "acceptable solution" image posted by @seveibar.

Before / After

Before (PackSolver2): caps cluster in a chaotic pile

After (this PR): caps are arranged in a clean horizontal row, centered at origin, with configurable gap:

[C7] [C8] [C9] [C10] [C11]
       ← centered at x=0 →

Implementation

Only one file changed in lib/ — SingleInnerPartitionPackingSolver.ts:

override _step() {
  // Specialized path for decoupling cap partitions
  if (this.partitionInputProblem.partitionType === "decoupling_caps" && ...) {
    this.layout = this._layoutDecouplingCapsLinear()
    this.solved = true
    return
  }
  // ... existing PackSolver2 path unchanged
}

_layoutDecouplingCapsLinear():

• Sorts caps deterministically by chipId (lexicographic) → stable CI results
• Centers the entire row at x=0, y=0
• Respects decouplingCapsGap property (fallback: chipGap → 0.2)
• Sets ccwRotationDegrees=0 for all caps (vertical, y+ pin on top per schematic convention)

Tests

All 6 new tests pass:

• ✅ All caps placed at y=0 (horizontal row)
• ✅ Deterministic sort by chipId
• ✅ Row centered at x=0
• ✅ Gap between adjacent caps = decouplingCapsGap
• ✅ Single cap placed at origin
• ✅ RP2040 full pipeline still completes successfully

Pre-existing IdentifyDecouplingCapsSolver06 failure is unrelated (circuit-to-svg export mismatch on main).

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[huangyebiaoke]

The CI failure in IdentifyDecouplingCapsSolver06.test.ts is a pre-existing issue unrelated to this PR:

SyntaxError: Export named 'convertCircuitJsonToSchematicSimulationSvg' not found in module 'circuit-to-svg/dist/index.js'

This error exists on main branch as well (run #22041362111). All 6 new tests in this PR pass ✅