v0.14.8

v0.14.8, 2026-09-06

Updates the base Python runtime to 3.14.7.

- Builds CPython 3.14.7 from its SHA256-verified official source archive.
- Uses the new runtime for aicodebox and every child image.
- Includes runtime libraries and compatible `python`, `python3`, `pip`, and
  `pip3` commands in the final image.