BZ-B TOOL KIT v3.1.3
====================
PRE-FLIGHT / LAUNCHER HOTFIX

- Fixed launcher pre-flight failure: "Illegal characters in path."
- Root cause: the launcher passed quoted %~dp0 as -Root. %~dp0 ends with a backslash, which can interact with native argument parsing so a literal quote reaches .NET path handling.
- Launcher now lets Tests\Preflight-Parse.ps1 derive the package root from $PSScriptRoot.
- Hardened manual -Root normalization and improved unexpected-error diagnostics.
- Added package-root/provider validation to the pre-flight parser.
- Added a regression test preventing reintroduction of the quoted %~dp0 -Root pattern.
- Fixed stale v3.1.1 regular expressions in Smoke-Test.ps1 that could falsely fail core/launcher version checks.
- Updated active product/version markers to 3.1.3.

v3.1.3 supersedes v3.1.2.
