v1.3.5: accented text on stdin, garbled-text guard, centred titles

Fixed

• Accented text sent on stdin arrived garbled on Windows. The CLI read stdin with sys.stdin.read(), which Python decodes with the Windows code page (cp1252) unless UTF-8 mode is on, so the "débutants" an agent sends as UTF-8 was stored as "débutants" and showed in the published page titles. Found in a rehearsal on 2026-10-21. Stdin is now read as bytes and decoded as UTF-8 (a UTF-8 or UTF-16 byte-order mark is honoured, and the code page is used only for bytes that are not valid UTF-8). A batch can also be passed as @file.json. The JSON the CLI prints is now plain ASCII with \u escapes, the same bytes in every console code page.
• Garbled text is refused before anything is written. Every command's strings are checked for words that read as UTF-8 decoded as cp1252: such a word encodes back to cp1252 bytes forming valid UTF-8, which a genuine accented word never does, so real French, Portuguese and symbols such as € or → pass. The error says how to resend the batch.

Added

• set_theme_style takes title_alignment (the theme's alignHero: center centres the header of every page).
• The site-publii-cloudflare skill watches the browser tab while the person signs in (Cloudflare, Google, Bing) and carries on as soon as the signed-in page appears, instead of asking to be told; it centres page titles by default, and explains how to pass batches as UTF-8.