Import the other two scripts rather than load them by hand

[andiwand]

store-copy.py reached two other scripts by opening them and running them
through importlib, because a hyphen is not something Python can import:

listing = load(ROOT / "scripts" / "store-listing.py", "store_listing")
changelog = load(ROOT / ".github" / "scripts" / "changelog-section.py", "changelog_section")

Both are renamed, and the load helper is gone:

import changelog_section as changelog
import store_listing as listing

Running a script puts its own directory first on the import path, so a plain
import finds a sibling with nothing set from outside. That only works if the
sibling is actually there, so changelog-section.py moves out of
.github/scripts - the release workflow was its only reader when it was filed
with the workflows, and store-copy.py writes the store text out of the same
section. resolve-version.py follows it so the folder goes rather than keeping
one file, and .github/scripts no longer exists.

Underscores are for the three files something imports; the scripts that are only
ever run keep their hyphens.

Not changed

No behaviour anywhere - every edit is a name, a path, or an import.

Checked

Each script run against 1.40: changelog_section.py prints the section,
store_listing.py reports what the release would refuse, resolve-version.py
resolves, and store-copy.py --help proves both imports resolve - from the
repository root and from /, since the import path follows the script and not
the working directory. The executable bit survived both moves, which the
workflow needs to run them by path. scripts/format.sh is clean.

🤖 Generated with Claude Code

https://claude.ai/code/session_01E6tn8P25cBDmrA67zrhfwN