docs: add Enterprise 0.55.0 release notes

[jlav]

• I have read and reviewed the documentation changes to the best of my ability.
• If the change is significant, I have run the documentation site locally and confirmed it renders as expected.

Summary of changes

These notes usually land after the Stable promotion. 0.55.0 is on Beta and hasn't been promoted yet, so this gets the page ready ahead of it.

The range covers 0.45.0, the current Stable release, through 0.55.0.

I applied the usual filters, so dependabot PRs, automated release PRs, and image tag bumps are all out.

One deliberate exception: the Polyform license entry stays in, even though it's a docs: commit and every other docs: entry got dropped. That PR rewrote LICENSE, which matters to customers more than its prefix suggests.

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