Implement reversible Sentinel beta foundation

release/beta/README.md

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+# OCSentinel Beta Channel
+
+This directory contains the current beta `version.json` only after a tested
+pre-release has been published. Pilot devices use this channel; stable devices
+continue to use `release/stable/version.json`.

release/beta/version.json

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+{
+  "channel": "beta",
+  "version": "1.5.0-beta.1",
+  "publishedAtUtc": "2026-07-29T23:04:51.9334773Z",
+  "artifactUrl": "https://gitea.officecom.cloud/officecom/oc-sentinel/releases/download/v1.5.0-beta.1/OCSentinelClient-win-x64.zip",
+  "sha256": "2bd6db7261f7ca9b47741968b922aea5969251539530e58441e882f53686ae6b",
+  "minUpdaterVersion": "1.0.0"
+}