Bug: EN index.astro used path.resolve('../../docs/wiki') which only
works in the dev environment. Production builds from staged copy at
astro/wiki/src/content/ — the other 3 pages already used this.
Added 'sl' to EXCLUDE so Slovenian pages don't leak into EN index.
Verified: 28 EN pages, zero SL leaks. model-selection-and-eval.md
and hive-routing.md render correctly at live wiki.clawdie.si.