feat(check): browser spaces-conformance adapter (runner #3)

[ascorbic]

check.cirrus.earth gains a 'space conformance' view: point it at any
spaces host and it runs the discovery and request-shape checks against
it. It imports only the dependency-free package root, so the alpha
crypto libs never enter the browser bundle (verified: no
atproto-space/node markers in dist) — the credential, sync and
host-role checks declare capabilities the browser cannot provide and
are reported as not-testable rather than silently skipped.

Third of the three runners, all over the same catalog: in-process
(vitest), CLI, and now browser — each honest about what it can and
cannot exercise.

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