Mindrealm v1 - Non-Destructive Clone Path Fix Checkpoint
Phoenix timestamp: 2026-1005-2145-0961

Fixes:
- Restored tools/bootstrap/Install-and-Compile.ps1 byte-for-byte to the current PHLEGM shared bootstrap engine.
- Restored Windows-Install-and-Compile.bat and Linux-Install-and-Compile.sh byte-for-byte to PHLEGM shared launcher bytes.
- upstreamInstallRelative is resolved from the freshly extracted working project root, so ../../Mindrealm resolves beside the Developer carrier as intended.
- Build-Mindrealm-v1.ps1 direct/manual fallback now uses the same project-root-relative path contract.
- End-User clone resolves ./**/Mindrealm/ recursively instead of assuming Mindrealm/ is directly at ZIP root.
- ZIP member paths are validated before extraction.
- Merge/replace remains non-destructive: colliding files are replaced, new files/directories are added, destination-only files are retained, and copied files are SHA-256 verified.
- Shared Compiler-UI.ps1 and Unknown Duration Progress behavior are unchanged.
