Covers plugin installation, certificate import from PKCS#12, composing
signed and encrypted messages, verifying received mail with signature
banners, managing trusted contacts, settings, and troubleshooting.
Includes a stub section for internal CA enrollment (coming v0.4.0, when
the browser half of C-08 ships). Scope: user-facing setup and usage only
(not admin plugin deployment or CA certificate issuance).
Uses mixed screenshots (where navigation works) and detailed text
descriptions for each workflow step. Glossary, version history, and
troubleshooting reference included.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
