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feat(pki): add isTrustListEmpty() and
getTrustedCertificateCount() to CertificateManager
(US-032)

Add two public methods for inspecting the trusted
certificate store without parsing internal files:

- isTrustListEmpty(): boolean — returns true when
  no certificates are in the trusted store
- getTrustedCertificateCount(): number — returns the
  number of trusted certificates

Both read the in-memory #thumbs.trusted index which
is kept in sync with trusted/certs/ by file watchers.

5 new tests verify empty, trust, multi-trust, reject,
and full-reject transitions.

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