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

.wiki/raw/README.md

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+# Raw Sources
+
+**Immutable.** Read, never edit.
+
+Place raw inputs here — articles, transcripts, PDFs, screenshots — exactly as they came in.
+
+For large or path-sensitive sources that live outside the repo, register them here:
+
+```
+- short-name → /absolute/path/to/source
+```