feat: implement PDIP and SPDIP footprints

[z5005z-hue]

Summary

Implements two new footprint families: PDIP and SPDIP.

---

PDIP (Plastic Dual In-line Package)

PDIP is the standard plastic through-hole DIP package. It delegates to the existing dip() implementation with canonical dimensions:

• Pitch: 100mil (2.54mm)
• Row spacing: 300mil (7.62mm) for ≤28 pins, 600mil (15.24mm) for 40-pin
• Supports all standard variants: pdip8, pdip14, pdip16, pdip28, pdip40, etc.

Closes #371

---

SPDIP (Shrink Plastic Dual In-line Package)

SPDIP uses a tighter 70mil pitch — common in PIC microcontrollers and similar ICs:

• Pitch: 70mil (1.778mm)
• Row spacing: 600mil (15.24mm)
• Primary variant: spdip28

Closes #180

---

Tests

All 6 tests pass, SVG snapshots generated:

✓ pdip8
✓ pdip14
✓ pdip16
✓ pdip8 parameters
✓ spdip28
✓ spdip28 parameters

[graphite-app]

This test file contains 6 test() calls (pdip8, pdip14, pdip16, pdip8 parameters, spdip28, spdip28 parameters), but the rule states that a *.test.ts file may have AT MOST one test(...). After the first test, the user should split into multiple, numbered files. To fix this, split the tests into separate files like pdip1.test.ts, pdip2.test.ts, etc., with each file containing only one test() call.

Suggested change

	test("pdip8", () => {
	const circuitJson = fp.string("pdip8").circuitJson() as AnyCircuitElement[]
	const svgContent = convertCircuitJsonToPcbSvg(circuitJson)
	expect(svgContent).toMatchSvgSnapshot(import.meta.path, "pdip8")
	})
	test("pdip14", () => {
	const circuitJson = fp.string("pdip14").circuitJson() as AnyCircuitElement[]
	const svgContent = convertCircuitJsonToPcbSvg(circuitJson)
	expect(svgContent).toMatchSvgSnapshot(import.meta.path, "pdip14")
	})
	test("pdip16", () => {
	const circuitJson = fp.string("pdip16").circuitJson() as AnyCircuitElement[]
	const svgContent = convertCircuitJsonToPcbSvg(circuitJson)
	expect(svgContent).toMatchSvgSnapshot(import.meta.path, "pdip16")
	})
	test("pdip8 parameters", () => {
	const json = fp.string("pdip8").json()
	expect(json.num_pins).toBe(8)
	expect(json.p).toBe(2.54)
	expect(json.w).toBe(7.62)
	})
	// SPDIP tests
	test("spdip28", () => {
	const circuitJson = fp.string("spdip28").circuitJson() as AnyCircuitElement[]
	const svgContent = convertCircuitJsonToPcbSvg(circuitJson)
	expect(svgContent).toMatchSvgSnapshot(import.meta.path, "spdip28")
	})
	test("spdip28 parameters", () => {
	const json = fp.string("spdip28").json()
	expect(json.num_pins).toBe(28)
	// 70mil pitch
	expect(json.p).toBeCloseTo(1.778, 2)
	// 600mil row spacing
	expect(json.w).toBeCloseTo(15.24, 1)
	})
	test("pdip8", () => {
	const circuitJson = fp.string("pdip8").circuitJson() as AnyCircuitElement[]
	const svgContent = convertCircuitJsonToPcbSvg(circuitJson)
	expect(svgContent).toMatchSvgSnapshot(import.meta.path, "pdip8")
	})

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



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[rushabhcodes]

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