Scaffold esphome-zepd and esphome-docs directories

Empty scaffold for the zEPD rebuild per claude/ZEPD_PLAN.md. Legacy
components/gxepd2 is left untouched as the before/after baseline.

esphome-docs/README.md

@@ -0,0 +1,8 @@
+# esphome-docs
+
+Skeleton for the zEPD documentation tree, mirroring the real ESPHome
+project's `esphome-docs` layout/naming so it can be extracted to its own
+repo later with no renaming.
+
+Empty placeholder — content comes once `esphome-zepd` has a stable
+component to document. See `claude/ZEPD_PLAN.md`.

esphome-zepd/README.md

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+# esphome-zepd
+
+The zEPD ESPHome component — a fresh rebuild of the e-paper display engine,
+replacing `code/components/gxepd2/` (left untouched as the before/after
+baseline during this migration).
+
+Scaffold only right now. See `claude/ZEPD_PLAN.md` and
+`claude/DESCRIPTOR_REGISTRY_PLAN.md` for the plan this tree implements.

esphome-zepd/components/zepd/__init__.py

@@ -0,0 +1 @@
+CODEOWNERS = ["@zib"]