feat(git): add host-specific git ignore and excludesfile

hosts/s/config/git/overrides/config

@@ -2,6 +2,9 @@
 [include]
 	path = ~/.dotfiles/config/git/shared
 
+[core]
+	excludesfile = ~/.dotfiles/config/git/overrides/ignore
+
 [gpg]
 	format = ssh
 

hosts/s/config/git/overrides/ignore

@@ -0,0 +1,32 @@
+.DS_Store
+.idea
+.run
+*.cache
+*~
+
+*-secret
+__secret
+__ignored
+__test_*.php
+__test_*.txt
+__test.php
+_theme
+*.sql.gz
+*.WordPress.*.xml
+cachegrind.out.*
+composer.phar
+wp_*.sh
+auth.json
+dfm.sh
+.scannerwork
+.phpactor.json
+.zsh_history
+
+**/.claude/settings.local.json
+**/.claude/*
+**/.serena/*
+**/docs/plans/*
+**/docs/superpowers/*
+CLAUDE.md
+TODO.md
+specs.md