### Bug Description ## Bug description When `remote-build` is run multiple times, the success message lists the same artifact filenames multiple times. ## Root cause `artifact_downloads` is a `dict[url → path]`. Different build runs produce different URLs but the same filenames. Since deduplication keys on URL, duplicate paths end up in `.values()`, causing the same snap name to appear multiple times in the output. ## Related canonical/snapcraft#6230 ### To Reproduce 1. Run `snapcraft remote-build` on a core22 project with multiple architectures 2. Wait for build to complete 3. Run `snapcraft remote-build` again on the same project 4. Observe the success message artifact names are listed twice ### part yaml ```shell name: my-snap base: core22 version: '0.1' summary: test snap description: test snap grade: devel confinement: devmode architectures: - build-on: amd64 - build-on: arm64 parts: my-part: plugin: nil ``` ### Relevant log output ```shell Build completed. Log files: ... Artifacts: my-snap_0.1_amd64.snap, my-snap_0.1_arm64.snap, my-snap_0.1_amd64.snap, my-snap_0.1_arm64.snap (same artifacts listed twice after running remote-build a second time) ```