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Adds conferences/2026/05-cadenas-y-archivos/presentacion.html, a single-file slide deck for lecture 5 (strings and files) to project in class next to the notes.

• 37 slides in five parts that follow notas.md: strings as sequences, string methods, files and encoding, try/except, and the word-counting project.
• Inline SVG diagrams: indices and slices, in as substring search, immutability as rebinding, split/join, the with block lifecycle, UTF-8 against cp1252 bytes for ñ, and the try/except decision flow.
• Seven slides marked "En vivo" list the steps to run on the laptop; the last slide builds that list from the marked slides.
• Outputs on the "En vivo" slides start hidden so students can predict them; R or a click reveals them. V jumps to the next live demo; a number plus Enter jumps to a slide; ? shows the keys.
• Every output, count and error message on the slides was produced by Python 3.14 on quijote.txt (196 words, wc -c 1121 bytes against len 1101 characters, longest word entresemana).

Checked by rendering all 37 slides in headless Chromium at 1600x900: no script errors, no overflow, keyboard controls exercised.

🤖 Generated with Claude Code