feat(org): themeable agenda header-row faces via org-faces-config

Each TODO keyword and priority cookie gets its own named face instead of sharing org's built-in org-todo / org-done / org-priority. org-faces-config.el defines org-faces-<keyword> and org-faces-priority-a..d (plus -dim variants for auto-dim), each with a real default color, and wires them through org-todo-keyword-faces and org-priority-faces once org loads. The file is org-faces-config, not org-faces, because org ships its own org-faces feature that the bare name would shadow.

This re-introduces the per-keyword/priority coloring that was stripped earlier, now as a named, theme-agnostic layer a theme can override. The design and the four resolved decisions are in docs/design/org-faces-spec.org; a theme-studio "org-faces" app and the auto-dim repoint follow in later phases.

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