Opens server.cfg, changes the filename input to server-renamed.cfg,
clicks Save, and asserts: the routed modal closes, the old name is
gone from disk, the new name carries the original content, and the
tree row swaps over. Pins the rename-on-save branch in
routedSaveClicked (the non-is_new path that diffs originalLeaf vs
editedFilename and emits `new_path`).
Deliberately omits __filesEditor.setContent — rename should preserve
the textarea-seeded content. A regression that wrote an empty body
fails on the content-equality assertion.
Tier 1 complete: 7 tests + fixture extension. Full suite runs in
<10s on warm Chromium.
Per docs/superpowers/plans/2026-05-17-files-overlay-e2e-handoff.md.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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