#2425 writes opaque rasters as 8-bit RGB; the owner-password render test
was written against the RGBA encoder. A rendered page is always opaque,
so the test asserts RGB and still counts inked pixels.
`pdfcraft-cli info`, `text`, `render` and `audit` rejected the owner
password of RC4-40, RC4-128 and AES-128 files with "the password is
incorrect", while `run doc_open` accepted it (#2670, item 8). The renderer
authenticates only the user password of revisions 2–4. `Session::open`
works around that by handing it the user password that owner
authentication recovers, but the CLI passed the typed password straight to
`inspect` and `PageRenderer`.
`pdfcraft_engine::render_password_for` now gives any render path outside a
session the password the renderer takes, sharing the recovery with
`Session::open`. The CLI uses it for the renderer and keeps the typed
password for the engine session and the cos document, so the owner
password still lifts copy restrictions in `text`.
The render test decodes the PNG and checks its dimensions and that it
has non-white pixels, for every algorithm with either password.
Refs #2670 (item 8 only).
Checks: cargo fmt --check; cargo clippy -p pdfcraft-cli -p pdfcraft-engine
--all-targets -- -D warnings; cargo test -p pdfcraft-cli; cargo test -p
pdfcraft-engine (and --lib); cargo xtask layers, assets, parity.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
aiongg