.fossil-settings/ignore-glob: sync .zig-cache + zig-pkg from .gitignore

The buildsuite commits added .zig-cache/ and zig-pkg/ to .gitignore (zig 0.16
cache and fetched-package extraction dirs beside the suite manifest) but the
derived fossil ignore-glob was not updated - fossil extras listed ~12k
zig-pkg/.zig-cache files under src/buildsuites/suite_tcl90. Same derivation
rules as the existing zig-cache/zig-out entries.

Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com

.fossil-settings/ignore-glob

@@ -72,8 +72,12 @@ todo.txt
 
 zig-cache
 */zig-cache
+.zig-cache
+*/.zig-cache
 zig-out
 */zig-out
+zig-pkg
+*/zig-pkg
 release
 debug
 build