chore: replace schemas/conduction symlink with schemas directory symlink

Replace the individual conduction symlink inside openspec/schemas/ with
a single symlink at openspec/schemas pointing to hydra schemas directory.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: WilcoLouwerse

openspec/schemas

@@ -0,0 +1 @@
+../../../../../../hydra/openspec/schemas