docs: document org-wide repo scope and auto-discovery

docs/ORG_SCOPE.md

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+# Organization scope
+
+The watcher monitors **every repository** under [github.com/heavy-duty](https://github.com/heavy-duty).
+
+Discovery is **search-based** (`gh search … --owner heavy-duty`), so new org repos are included automatically — no allowlist edit required.
+
+As of 2026-07-18 the org includes (non-exhaustive snapshot):
+
+- platform, box, rig, cast, infra, handbook, incubator
+- bulldozer, bulldozer-examples, wallet-adapter, nx-anchor, anchor
+- znap (+ example, shuttle, tokio, hats)
+- solana-utils, spl-utils, calculate-leaderboard
+- drill-* actions, bounty-program helpers
+- metaplex-series, nft-as-a-wallet, solfate-images, solana-colombia-hacker-house-bounty-program
+- .github
+
+Refresh anytime:
+
+```bash
+gh api orgs/heavy-duty/repos --paginate --jq '.[].full_name' | sort
+```