Propagate no-Claude-attribution rule into repo-level CLAUDE.md

Author: zaidwhy

CLAUDE.md

@@ -68,4 +68,7 @@ All LLM calls are mocked in tests - no API key needed. GitHub Actions runs pytes
 ## Other gotchas
 
 - Never use the em dash character (U+2014) anywhere; use " - " instead.
+- Never add Claude/Anthropic attribution anywhere: no `Co-Authored-By: Claude` trailer, no
+  "Generated by Claude Code" / "🤖 Generated with [Claude Code](...)" footer on any commit,
+  PR description, or PR comment. Strip it from any default tooling template before using it.
 - `data/` is gitignored and ephemeral - regenerate via `ingest` rather than committing memory/vector data.