Voice notes were always recognized with a hardcoded English locale,
which broke transcription for non-English speakers. The handler now
maps the profile's `preferred_language` to a BCP-47 code and passes it
to the Google recognizer, falling back to `pt-BR`.
Also neutralizes the persona prompt so it follows the selected
language instead of forcing Brazilian Portuguese and a fixed gender,
and resets the default `preferred_language` to `pt`.
Introduce a language selection command backed by a supported-language
table and per-language response instructions. The chosen code is stored
as `preferred_language` in the user profile and injected into the system
prompt so replies follow the selected language, with an `auto` option
for detection.
Also refreshes the agent and user profile timestamps and appends the
latest conversation context entries.
Extend the /help message so users can discover the full user manual
with examples and tips via /manual, and view system information,
version, author, and license via /about.
Also includes the generated conversation context snapshot for
2026-10-26 and the recompiled agent bytecode.
marcocosta10000