chore: bootstrap poller-sandbox (test project for autonomous poller)

.wiki/index.md

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+# Wiki Index
+
+Catalog of all wiki pages. One line per page, organized by type.
+
+## Overview
+
+- [overview.md](overview.md) — project overview
+
+## Entities
+
+<!-- (none yet) -->
+
+## Concepts
+
+<!-- (none yet) -->
+
+## Packages
+
+<!-- (none yet) -->
+
+## Sources
+
+<!-- (none yet) -->