A pod could not say WHICH build it was running, which is exactly the question a
cached ':latest' raises — an images pod reported a dependency missing that had
already been published under that tag. The build now bakes IMAGE_TAG in, so the
boot record names the image.

/boot also showed only 'lifespan start': the seed registration and the end of
startup were plain prints. They are phases now, so one request covers the whole
boot including how many seeded models registered and whether that step failed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0182DhR1eFNPQyGmDrpHbedY