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doc: add CLAUDE.md guidance on rebasing vs changing PR base (#13652)

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This PR adds a short guidance note to `.claude/CLAUDE.md` clarifying
that "rebase onto X" requests should only change the local branch base,
never the PR's `--base` target on GitHub. The Lean4 workflow
specifically uses `nightly-with-mathlib` as a rebase target to get a
mathlib-tested snapshot for CI, while the PR continues to target
`master`.

🤖 Prepared with Claude Code

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Kim Morrison 2026-05-09 21:34:50 +10:00 • committed by GitHub
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.claude/CLAUDE.md
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@ -155,3 +155,9 @@ Test files (in `tests/`) do not need copyright headers.
## Test Module Docstrings
Every test `.lean` file must include a module docstring (`/-! ... -/`) briefly explaining what the file tests. For regression tests, reference the issue (e.g. `#13599`). Place the docstring after the `import` block, if any.
## Rebasing vs PR base
When asked to "rebase a PR onto X", **only change the local branch base** — never change the PR's `--base` target on GitHub unless explicitly told to.
Common Lean4 case: rebasing onto `nightly-with-mathlib` is done to get a mathlib-tested snapshot for CI; the PR still targets `master`.