PathBuf::from("data/systems.db") was cwd-relative, and a spawned
server inherits GODOT's cwd — which is client/ (Godot's --path client
chdirs), so CultureResolver, CityContextReader, BodySourceResolver and
BrowseReader all silently failed in every make atlas / make game
spawn. Wave 1 masked it: the star map serves from star_map_data.json,
so 'renders 301 systems' never touched the DB; T-1133's browser was
the first DB-backed consumer to hit it live (Stig, /proc/PID/cwd).
resolve_systems_db_path(): exe-anchored <exe_dir>/../../data/systems.db
first (cwd-independent — the actual fix), then cwd-relative
data/systems.db (cd server && cargo run), then server/data/systems.db
(repo-root invocations); first existing candidate wins, info-logged.
Pure systems_db_candidates() split out as the testable seam (5 unit
tests — incl. pinning Path::parent() of a bare filename = Some(""),
not None). world_root now derives from the resolved ABSOLUTE path so
its ancestors().nth(3) arithmetic holds unconditionally instead of
silently falling back to ".." when canonicalize failed.
Verified all three launch styles; make atlas spawn shows 5 reader fds
open on server/data/systems.db via /proc/PID/fd.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5
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