Improve dependency tracking

[Shushe] / .metadata-format-changed-since

diff --git a/.metadata-format-changed-since b/.metadata-format-changed-since
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+SPDX-FileCopyrightText: 2024 Lady <https://www.ladys.computer/about/#lady>
+SPDX-License-Identifier: CC0-1.0
+
+The following hash indicates a commit in which the metadata format
+generated by ⛩📰 书社 was different than it currently is :⁠—
+
+c84c2b38caf34807fd1c52a8f19fcf0af7e9807e
+
+The purpose of this file is to serve as a trackable dependency which
+will prompt a rebuild of metadata when the generation mechanism
+changes.