Companion to the just-shipped files-overlay rewrite. The rewrite
verified each step's behavior live in Chromium but left no automated
browser regression net. This handoff plan specifies what to add:
* Fixture extension (conftest.py): a files_overlay_server fixture
that seeds a files-type Overlay with one text file, one binary
file, and a nested folder under tmp_path-rooted LEFT4ME_ROOT.
* 11 test cases in three tiers — Tier 1 covers the critical paths
(text edit save, create-new, 409→askConflict, binary replace,
new-folder + delete, rename-on-save), Tier 2 rounds out drag /
upload / deep-link, Tier 3 hits the server-detail download
button.
* Patterns to follow + pitfalls (the SESSION_COOKIE_SECURE=0 gotcha,
the data-rel-path location split between text and binary modes,
the htmx.ajax async wait, why os-drag-with-folders can't be
synthesized).
Pinned references at the bottom point at the existing test_editor.py
pattern model and the relevant module-header comments. Estimated
half-day for the critical 7 cases, full day for the full 11.
Lives under docs/superpowers/plans/ per the project's planning-
artifact convention. Move to specs/ if it's executed and turned into
shipped tests.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
