feat: publish Gamertan Tend preview source

Sanitized root snapshot from private source commit a72903c63e1753f9e6ffbf40453c0830bdfc05c5 and tree 295641e67eef5979da76746d8ae271249568263e. Private development history and workflows are excluded by the exact allowlist.

AI-assisted: OpenAI Codex helped implement, test, and audit this preview.
Signed-off-by: Cole Speelman <crspeelman@gmail.com>

scripts/check-licenses.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: AGPL-3.0-only
+set -euo pipefail
+root=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
+test -s "$root/LICENSE"
+test -s "$root/COPYRIGHT"
+test -s "$root/examples/LICENSE"
+while IFS= read -r file; do
+	grep -Fq 'SPDX-License-Identifier: AGPL-3.0-only' "$file" || { echo "missing SPDX identifier: $file" >&2; exit 1; }
+done < <(find "$root/cmd" "$root/internal" -type f -name '*.go' -print | LC_ALL=C sort)
+echo "license boundaries verified"