Add HIGHLIGHTS.md — top 15 experiences with links to stop files

HIGHLIGHTS.md

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+# Trip Highlights — Top 15 Experiences
+
+The must-not-miss moments across the whole trip. Each links to the full stop file.
+
+---
+
+## Unmissable Views
+
+1. ⭐ **[Slieve League Cliffs, Donegal](locations/06a-donegal.md)** — The highest accessible sea cliffs in Europe, three times the height of the Cliffs of Moher, with a fraction of the crowds. Walk the One Man's Pass ridge for full effect.
+
+2. ⭐ **[Snaefell Summit, Isle of Man](locations/04-isle-of-man.md)** — The only place on earth where you can see five countries (England, Ireland, Scotland, Wales, Isle of Man) from one spot. Take the mountain railway up.
+
+3. ⭐ **[Keem Bay, Achill Island, Mayo](locations/06c-mayo.md)** — A pristine turquoise beach sitting in a natural cliffside amphitheatre. One of the most dramatic coastal landscapes in Ireland.
+
+4. ⭐ **[Cliffs of Moher at dawn, Clare](locations/06f-clare.md)** — Go before 9am. The cliffs are the same; the crowd is not. Walk south to Hag's Head for the best elevated perspective.
+
+5. ⭐ **[Slea Head Drive, Dingle, Kerry](locations/06g-kerry.md)** — The westernmost point of Europe. Beehive huts, ruined forts, the Blasket Islands across the water, Connor Pass above. The definitive Atlantic edge drive.
+
+---
+
+## History & Culture
+
+6. ⭐ **[Skellig Michael, Kerry](locations/06g-kerry.md)** — A 6th-century monastery on a sea stack 12km offshore. 618 stone steps, puffins, Star Wars. One of the most extraordinary places in Europe. **Book the boat in advance.**
+
+7. ⭐ **[Dún Aonghasa, Inis Mór, Galway](locations/06e-galway.md)** — An Iron Age stone fort sitting directly on the edge of a 100m Atlantic cliff. No safety fence. The most dramatic ancient site in Ireland.
+
+8. ⭐ **[Giant's Causeway, Causeway Coast](locations/05-belfast.md)** — 40,000 hexagonal basalt columns formed by ancient volcanic activity. UNESCO World Heritage Site. Day trip from Belfast — go early.
+
+9. ⭐ **[Castle Rushen, Isle of Man](locations/04-isle-of-man.md)** — One of the best-preserved medieval castles in Europe, built by Norse kings. More impressive inside than it looks from the outside.
+
+10. ⭐ **[Book of Kells, Trinity College Dublin](locations/07-dublin.md)** — A 9th-century illuminated gospel manuscript and the Long Room library — one of the most beautiful rooms in the world. Book ahead.
+
+---
+
+## Food, Drink & Music
+
+11. ⭐ **[Traditional music session, Doolin, Clare](locations/06f-clare.md)** — Three pubs, sessions every night in August. McGann's, Gus O'Connor's, McDermott's. The real thing — not a tourist performance.
+
+12. ⭐ **[Seafood in Dingle, Kerry](locations/06g-kerry.md)** — Out of the Blue and Ashe's are the picks. The freshest seafood on the Wild Atlantic Way, in the most atmospheric town.
+
+13. ⭐ **[Matt Molloy's, Westport, Mayo](locations/06c-mayo.md)** — The pub owned by The Chieftains' flautist. Traditional music nightly. One of the best pub nights in Ireland.
+
+14. ⭐ **[Tigh Neachtain, Galway](locations/06e-galway.md)** — The traditional music epicentre of the Latin Quarter. Sessions most nights; Ard Bia nearby for the best meal in Galway.
+
+---
+
+## Unique to This Trip
+
+15. ⭐ **[Aer Lingus College Football Classic, Aviva Stadium, Dublin — Aug 30](locations/07-dublin.md)** — Notre Dame vs Navy in a 51,700-seat stadium in Dublin. One of the most unusual sporting events in the world. The whole city gets involved.