parseOutdatedJSON decodes brew outdated --json into OutdatedPackages,
which separates formulae from casks — the plain-text output is just
names with no type information. Codable structs mirror the JSON shape,
with convertFromSnakeCase mapping installed_versions to Swift naming.
Undecodable input (brew error text, empty output) parses as .none.
The legacy line parser stays until callers switch over next commit.
Covered by 4 new unit tests.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Extract brew output parsing into BrewParser.swift (pure Swift, no AppKit)
and add BrewBarTests target with 7 passing tests covering parseOutdated
and parseVersion edge cases.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
maxsoch