fix(audit): read the catalogue registry from site/prepared and admit docs/evidence images

[apresmoi]

Change

The "Check documentation links and organization" step of the repository audit fails on main. Two refactor moves left it behind:

• site/directory/objects.mts now imports the catalogue from ../prepared/prepared-catalogue.mjs (refactor(site): write generated site outputs into site/prepared #1358). The provenance inventory only recognised ./prepared-…, found no registered bodies and stopped. It now accepts any relative path to the prepared catalogue and reads 5,317 registered bodies on main.
• The evidence images moved to docs/evidence/ (refactor(docs): move the evidence images into docs/evidence/ #1409). The docs checker admitted only docs/images/ and refused all eleven files. It now admits images under docs/evidence/ and each capture's receipt.json; other files there are still refused.

Evidence and limits

Proves the change: each new test fails against the old script and passes with the fix: test_catalogue_import_from_the_prepared_folder_is_recognised and evidence images and their capture receipt are admitted under docs/evidence/, other files are not.

Limits: the step stays red on one remaining finding owned by the stellar corona work: docs/stellar-corona-from-magnetic-maps.md links packages/bake/src/objects/stellar/corona/models.test.mts, which does not exist. The "directory grew past its baseline" step is a separate failure and is not changed here.