v1.0.0-pre.9

Changed

• debug and release targets now produce both a shared and static library alongside each other
• obj directories split into shared/ and static/ subdirs to keep -fPIC objects isolated
• install no longer depends on release; guards with an existence check and exits with a clear message if artifacts are missing
• uninstall removes static lib alongside shared lib
• build.sh: install and uninstall now handle privilege escalation automatically via doas or sudo; skips escalation if already root
• updated Windows installation instructions to clarify stk.dll vs stk.lib depending on link type

Full Changelog: v1.0.0-pre.8...v1.0.0-pre.9