Add the tools sub-project with the run_llm batch runner

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tools/.env.example

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+# Tools for A Feminist Audit of Pop Music.
+# Copyright 2026 imacat.  All rights reserved.
+# Authors:
+#   imacat@mail.imacat.idv.tw (imacat), 2026/7/31
+
+# The Anthropic API key
+ANTHROPIC_API_KEY=sk-ant-...