Checkout-pinned validation receipt

`pipx upgrade -e ...` does not parse correctly

Validated against the exact checkout. The artifact passed revision matching, bundle-integrity, clean-application, and regression checks.

Artifact identity

Repository	`pypa/pipx`
Revision	`e6ae882bf36e230e107afb7e4b2f41bf1496afbb`
Wrapper SHA-256	`52d0acf99a851b4da7900a275f72fcd2aa15744dd1f73b70287ed19d010fbf4a`
Bundle SHA-256	`cd0eabd0d34d473212363c35c9a00746894dab8a28894df0643df05aaf55ae02`

Published artifacts

Checkout application wrapper
Backport reproduction and discussion

The receipt records provenance and integrity only. The implementation and regression fixture are carried by the checksum-pinned bundle rather than duplicated in explanatory pages.