feat: dns compatible sentinel ids

[chronark]

use sentinel ids as k8s names so we don't have to look them up every time

main changes:

• make uid.New always create (mostly) dns-safe ids
• add converter methods to translate from prefix_xxx to prefix-xxx and back
• hook up the sentinel logic to use these instead of k8s_name

[vercel]

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Project	Deployment	Actions	Updated (UTC)
dashboard	Ready	Preview, Comment	Feb 19, 2026 11:28am
engineering	Ready	Preview, Comment	Feb 19, 2026 11:28am

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