Add specialized linear layout for decoupling capacitor partitions (#15)

[AouIssa]

Problem

PackSolver2 scatters decoupling capacitors in messy irregular patterns instead of arranging them in clean horizontal rows like professional schematics.

Solution

Early-return in SingleInnerPartitionPackingSolver._step() when partitionType === "decoupling_caps" — bypasses PackSolver2 and arranges caps in a horizontal row via createLinearDecouplingCapLayout().

Zero impact on non-decoupling partitions.

Results

Two separate partitions arranged by voltage rail:

Partition 1 (V3_3 + GND): C12, C13, C14, C15, C19, C8 — all Y=-5.956, gaps exactly 0.2mm
Partition 2 (V1_1 + GND): C18, C7 — all Y=-1.953, gap exactly 0.2mm

Visual Proof

SVG snapshot tests included using bun-match-svg:

• Full pipeline layout snapshot (all components)
• Partition-only snapshot (just the decoupling cap row)

Demo video attached below.

Tests

• 19 pass (17 existing + 2 new), 0 regressions
• bun run format:check clean
• tsc --noEmit clean

Addresses feedback from PRs #27 and #28 regarding visual snapshot testing.

/claim #15

decoupling-caps-demo.mp4

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[AouIssa]

Before vs After

Partition comparison (PackSolver2 → Linear Row)

Full pipeline — Before (main branch)

Full pipeline — After (this PR)