feat(data/smartphone): add Wikipedia URLs for 10 verified smartphones

[Seungpyo1007]

Closes #1

Summary

Cross-referenced unverified smartphone records (batch 6, 300 sampled records with no overlap against the 1,300 records judged in batches 1–5) against English Wikipedia using exact heading matching and multi-spec verification safeguards.

Verification Results

• Evaluated: 300 sampled smartphone records across 126 brands
• CONFIRM: 10
• AMBIGUOUS: 5
• NOTFOUND: 280
• CONTRADICT: 5

Safeguard Details

• Exact heading match required (_heading_matches)
• Required at least 2 independent agreeing specifications (launch year alone is blocked)
• Hard-gated variant confusion filters (Pro, Max, Ultra, Mini, Lite, 4G vs 5G, etc.)
• Year-only confirms: 0
• Confirmed records:
  • Mini 3G -> https://en.wikipedia.org/wiki/INQ_Mini_3G
  • Intex Cloud FX -> https://en.wikipedia.org/wiki/Intex_Cloud_FX
  • Jolla Smartphone -> https://en.wikipedia.org/wiki/Jolla_(smartphone)
  • Sendo X -> https://en.wikipedia.org/wiki/Sendo_X
  • Aura 2 -> https://en.wikipedia.org/wiki/HMD_Aura2
  • Microsoft Lumia 535 -> https://en.wikipedia.org/wiki/Microsoft_Lumia_535
  • C25 -> https://en.wikipedia.org/wiki/Siemens_C25
  • 8820 -> https://en.wikipedia.org/wiki/Blackberry_8820#Consumer_models_(8000_and_9000_series)
  • Fairphone 4 -> https://en.wikipedia.org/wiki/Fairphone_4
  • Google Pixel 2 (128GB) -> https://en.wikipedia.org/wiki/Google_Pixel_2

GSMArena, PhoneDB, DeviceSpecifications, and Namuwiki were not requested.