feat(es): add Spanish coding exercises (Tier 1-3)

languages/es/README.md

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+# Spanish (Español) - Legesher Python
+
+## Getting Started
+
+### Run the Hello World Example
+
+```bash
+legesher run languages/es/hello_world.py --lang es
+```
+
+### Translate Between Languages
+
+```bash
+# Spanish to English
+legesher translate languages/es/hello_world.py --from es --to en
+
+# English to Spanish
+legesher translate languages/en/hello_world.py --from en --to es
+```
+
+## Files in This Folder
+
+| File | Description |
+|------|-------------|
+| `hello_world.py` | Simple example program in Spanish |
+| `REFERENCE.md` | Complete keyword and builtin reference |
+
+## Coding Exercises
+
+Practice writing Legesher Python in Spanish with these tiered exercises.
+
+### Tier 1 — Basic (⭐)
+
+| File | Exercise | Difficulty | Time |
+|------|----------|------------|------|
+| `exercises/tier1/juego_del_7.py` | El Juego del 7 — FizzBuzz-style counting game | ⭐ | 10 min |
+| `exercises/tier1/factorial.py` | Factorial — recursive factorial function | ⭐ | 10 min |
+| `exercises/tier1/palindromo.py` | Palíndromo — palindrome check | ⭐ | 10 min |
+| `exercises/tier1/ordenamiento.py` | Ordenamiento — bubble sort without builtins | ⭐⭐ | 15 min |
+
+```bash
+legesher run languages/es/exercises/tier1/juego_del_7.py --lang es
+```
+
+### Tier 2 — Applied (⭐⭐)
+
+| File | Exercise | Difficulty | Time |
+|------|----------|------------|------|
+| `exercises/tier2/analizador.py` | Analizador de Archivos — CSV file parser | ⭐⭐ | 20 min |
+| `exercises/tier2/frase_del_dia.py` | Cliente API Simple — daily quote API client | ⭐⭐⭐ | 25 min |
+| `exercises/tier2/transformador.py` | Transformador de Datos — JSON grade converter | ⭐⭐ | 25 min |
+| `exercises/tier2/calculadora.py` | Calculadora — interactive calculator | ⭐⭐ | 25 min |
+
+```bash
+legesher run languages/es/exercises/tier2/calculadora.py --lang es
+```
+
+### Tier 3 — Domain-specific (⭐⭐⭐)
+
+| File | Exercise | Difficulty | Time |
+|------|----------|------------|------|
+| `exercises/tier3/fifa_rating.py` | Análisis de Datos — custom FIFA rating system | ⭐⭐⭐ | 40 min |
+| `exercises/tier3/raspador.py` | Raspador Web — HTML scraper (marca.com) | ⭐⭐⭐⭐ | 60 min |
+| `exercises/tier3/piedra_papel_tijera.py` | Piedra, Papel, Tijera — multi-round game | ⭐⭐⭐ | 45 min |
+| `exercises/tier3/cribo.py` | Cribo de Eratóstenes — prime number sieve | ⭐⭐⭐ | 40 min |
+
+```bash
+legesher run languages/es/exercises/tier3/fifa_rating.py --lang es
+```
+
+## Quick Reference
+
+See [REFERENCE.md](./REFERENCE.md) for the complete list of keyword and builtin translations.
+
+## Need Help?
+
+- [Main Tutorial](../../docs/tutorials/TUTORIAL.md) - Detailed instructions
+- [Documentation](https://docs.legesher.io) - Full documentation