* feat: detect ghostty config files by canonical path
Problem: enabled() only checked for the 'ghostty' filetype, but many
users have ghostty config files detected as 'config' or with no
filetype set. These users got no completions.
Solution: check canonical ghostty config directories
($XDG_CONFIG_HOME/ghostty, ~/.config/ghostty, /etc/ghostty) when the
filetype is 'config' or empty, resolving symlinks to handle indirect
paths.
* fix: revert blanket diagnostics.disable and selene comments
Problem: .luarc.json blanket-disabled four diagnostic categories
project-wide, and selene inline directives were added to suppress
warnings on io.open monkey-patching in tests.
Solution: revert .luarc.json to match main and remove selene comments.
* fix(ci): resolve selene and lua-ls CI failures
Problem: selene flags io.open assignments in test mocks as
incorrect_standard_library_use, and lua-ls reports undefined blink.cmp
types and a need-check-nil on enums_cache. These are pre-existing
issues on main that surface when Lua files change.
Solution: add targeted selene allow comments on the two io.open
mock lines, add minimal blink.cmp type stubs for lua-ls, and
include enums_cache in the nil guard.
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