Without middleware, any caller on a non-production instance could mint a
bearer token for any workspace UUID with no authentication. AdminAuth is
defence-in-depth: on a fresh install (no tokens yet) it is fail-open so
the bootstrap path still works; once the first workspace enrolls a token
all callers must present a valid bearer.
Adds two router-level tests confirming the gate:
- TestTestTokenRoute_RequiresAdminAuth_WhenTokensExist → 401 with no header
- TestTestTokenRoute_FailOpenOnFreshInstall → 200 (bootstrap path intact)
Env-var gating inside GetTestToken is retained as a second layer.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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