Record conda-ship runtime ownership during installation

[jezdez]

Description

Add the optional conda_ship_runtime construct setting for SH, PKG, EXE, and MSI installers.

The mandatory installer path invokes v1/record-installation on the stamped executable after package installation. It records ownership, installation kind, stable executable path, and an optional external instruction in the existing runtime metadata file.

This is not a user post-install script and cannot be skipped through user-script options.

Depends on jezdez/conda-ship#94.

Closes #1299.

Checklist - did you ...

• Add a file to the news directory (using the template) for inclusion in the next release notes?
• Add / update necessary tests?
• Add / update outdated documentation?

[jezdez]

Closing this draft because no downstream construct currently consumes conda_ship_runtime. The direct and external ownership work can proceed in conda-ship and conda-runtime without adding mandatory integration to four constructor backends. Issue #1299 remains open for a concrete constructor-based distribution.