v0.1.0-alpha.6 - Hardened Linux one-click installer

Alpha release with a hardened Linux one-click installer. The Linux install script now supports default /opt installs, user-writable fallback under ~/.local/share when /opt is unavailable, explicit custom install roots, stable launchers in ~/bin, automatic core archive extraction, and cleaner payload copying that excludes .git/workspace/log artifacts. Previous cross-PDK Spectre/HSPICE LUT validation remains included. Public repository excludes private AmpSys/yami/TheScanner/acsolver source; release zip contains obfuscated core binaries only. This plugin is an initial design aid, does not include PDK files or simulators, remains free/public-benefit software, and users must independently verify all tapeout-impacting results.