- visualization.py: drop the CSV string-split branch. The Astrolabe PHP
client sends path_prefixes as a JSON array, so only a list is accepted;
any other shape is ignored rather than comma-split (which would corrupt
folder names containing commas).
- viz_routes.py: split the path_prefixes query param on newline (a comma
is a valid POSIX path char; a newline is not) and pass None instead of
[""] when the param is absent.
- access_filter.py: widen build_base_filter_conditions' path_prefixes to
Iterable[str] for consistency with normalize_path_prefixes.
- ADR-027: document the newline delimiter (frontend/viz route) and JSON
array (PHP->MCP body), and the PHP-side cap on list width.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
