feat: cleanup dangling images + arm version 0.17.0#19
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light-runner already reaps containers, volumes, cache images, networks and state files, but nothing pruned dangling images (untagged `<none>` layers left by re-pulls and rebuilds), so disk crept up over time with no recourse. - Add DockerRunner.cleanupDanglingImages(): lists `dangling=true` and removes each without force. Never touches a tagged image, so base images and reusable tags survive; layers still referenced by a live image or container are refused by the daemon and skipped. Cache images stay under cleanupOrphanCache. - e2e test: commit an untagged image from alpine, assert the sweep removes it and leaves the tagged base image intact. - Bump TRACER_VERSION to 0.17.0 (was stuck at 0.16.2 from the prior release race) so OTel scope version matches the package again. This is the SDK half of closing the retention gap. light-run arms it (plus the existing reapOrphans/cleanupOrphanCache/cleanupOrphanNetworks/reconcileStates) on a periodic sweep. build with cc
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Add DockerRunner.cleanupDanglingImages(): prunes dangling image layers left by re-pulls/rebuilds, the one Docker resource light-runner created but never reclaimed. Removes dangling without force, never touches a tagged image; cache images stay under cleanupOrphanCache. Bumps TRACER_VERSION to 0.17.0. e2e: commit untagged image, assert removed, base image survives. light-run arms this on a periodic sweep. build with cc