Add PACKING.md — driving trip packing list for 3 colleagues

PACKING.md

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+# Packing List — Summer Roadtrip 2026
+
+> 3 colleagues, electric car, ~4 weeks. Driving through UK, Isle of Man, Ireland, France.
+
+## Documents & Admin
+- [ ] Passports — all 3 (valid beyond Sep 2026)
+- [ ] Ferry booking confirmations — Stena Line (booked), Steam Packet (IoM), Irish Ferries (Dublin→Cherbourg)
+- [ ] Green card / car insurance confirming coverage in UK, Ireland, and France
+- [ ] GHIC cards × 3 (European Health Insurance Card replacement — free via NHS/German equivalent)
+- [ ] International driving permit if any licence is non-EU/non-UK
+- [ ] Printed hotel/accommodation confirmations for first few nights
+- [ ] Aviva Stadium tickets (Aug 30) + Bon Jovi tickets if going (Aug 31)
+
+## Electronics & Work
+- [ ] Laptops × 3
+- [ ] USB-C chargers × 3
+- [ ] USB-C hub/dock (at least one — shared for desk setup in hotels)
+- [ ] UK 3-pin travel adapters × 3 (needed from Harwich arrival onward; Ireland uses same plug as UK)
+- [ ] Mobile hotspot device or designated SIM phone
+- [ ] USB charging cables (USB-C, Lightning if needed)
+- [ ] Power bank × 1–2
+- [ ] Headphones for calls
+
+## Car & EV
+- [ ] Type 2 charging cable (check if your car carries one; mode 2 granny cable as backup)
+- [ ] CCS to CHAdeMO adapter if your car needs it for rapid chargers
+- [ ] Charging network apps pre-loaded: Zap-Map (UK), ESB ecars (Ireland), Chargemap (France/Europe), ABRP (route planning)
+- [ ] Warning triangle (required in France)
+- [ ] Reflective safety vests × 3 (legally required in France; keep accessible, not in boot)
+- [ ] Tyre inflator / portable compressor
+- [ ] Basic puncture repair kit
+
+## Clothing (per person)
+- [ ] Waterproof jacket — non-negotiable for Atlantic Ireland
+- [ ] Mid-layer fleece or down jacket (evenings on the coast are cold even in August)
+- [ ] T-shirts / shirts × 4–5
+- [ ] Trousers / jeans × 2
+- [ ] One smart outfit for Dublin game day (Aug 30) — American football crowd, smart casual is fine
+- [ ] Comfortable walking shoes — you'll be on your feet a lot
+- [ ] Light hiking boots or trail runners — for Croagh Patrick, Slieve League, and other walks
+- [ ] Rain-resistant trousers or gaiters (optional but useful on exposed cliff walks)
+- [ ] Swimwear (Keem Bay, Strandhill, and other beaches are worth it)
+
+## Toiletries & Health
+- [ ] Travel-size toiletries
+- [ ] Any prescription medication (enough for 4 weeks + buffer)
+- [ ] Sunscreen (yes, even Ireland — the UV is real when it's sunny)
+- [ ] Blister plasters (for hike days)
+- [ ] Basic first aid kit
+
+## Nice to Have
+- [ ] Binoculars — Slieve League cliffs, Skellig Michael boat trip, and Giant's Causeway bird life
+- [ ] Reusable water bottles × 3
+- [ ] Dry bags — for coastal walks and ferry decks in Atlantic weather
+- [ ] Small daypack per person (for hike days; leave luggage in car)
+- [ ] Snacks for the car — Ireland's west coast has long stretches between food stops
+- [ ] Portable phone mount for car navigation