Adds tests/cryptpad/playwright/test_pad_content_roundtrip.py: open /pad/ → CryptPad auto-creates a
fragment-keyed pad → type a unique marker into the CKEditor body → wait for encrypted sync → open a
FRESH browser context (no shared localStorage/cookies) → navigate to the captured pad URL → assert
the marker survives in the re-decrypted body. Proves genuine end-to-end-encrypted server-side
persistence (the fresh session carries only the URL+fragment key), the §4.3 create-and-read-back
floor F2-9 requires — not a health/SPA stand-in.
Empirically mapped against CryptPad 2026.2.0 (the prior deferral cited version-fragility on 5.7.0):
editor is the deep nested frame …/pad/ckeditor-inner.html; ~15s cold-cache LESS-compile init; the
fragment-keyed pad URL DOES appear after init; transient net::ERR_NETWORK_CHANGED handled by the
shared goto_with_retry + a mid-load reload retry in the frame wait. PASSED against a live probe
instance. PARITY.md updated (roundtrip = the P3/§4.3 test; SPA-render test kept as fast liveness).
F2-9 is Adversary-owned — left for the Adversary to close after cold-verify.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
autonomic-bot
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