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modules/face-diagnostic.el carries the Phase 1 core of the face-at-point diagnostic: cj/--face-diagnosis-at returns a plist with the buffer classification (theme-faced / terminal-ansi / document-shr / image-no-text), the character context (char, codepoint, Unicode name, script), and the face stack separated by source (text-property faces, overlays by priority, active face-remapping-alist entries, default). Built from small pure helpers, no display or prompts. 17 ERT tests cover Normal/Boundary/Error per helper. Not yet wired into init.el; the interactive command, rendering, and keybinding land in Phase 4. Spec: docs/specs/face-font-diagnostic-popup-spec.org.
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