[sanohiro]

Screenshots previously read the content FBO before the tab bar, terminal cursor, and later overlays were drawn. Capture now runs after composition, immediately before buffer swap, and waits while presentation is deferred. The capture's own success flash starts afterward; hardware cursor planes remain outside the PNG.

Adds a temporary SSH-controlled virtual keyboard for testing bcon on real VTs. A sudo-started helper opens uinput, drops privileges, verifies Unix-socket peer credentials, and sends bounded key taps. It releases keys on interruption and disables input when the target process exits or the foreground VT changes. Includes a launcher, read-only environment probe, setup guidance, and CI coverage. Input is seat-wide and requires an exclusively reserved session.

Validation:

• cargo test --locked: 65 passed, 1 hardware-dependent test ignored.
• cargo build --release --locked: passed.
• 18 helper protocol/lifecycle tests passed, including real socket exchange with a fake keyboard.
• Live Parallels ARM64 test at 1024x936 confirmed tab bar, divider, terminal cursor, and 42% progress overlay in PNGs. Exercised focus, zoom/unzoom, and test-tab cleanup; service restart count stayed zero.

Limits: no claim of hardware-pointer capture, host scanout/flicker verification, or full application compatibility. Resize/reflow observations remain separate review candidates. No release or version bump is included.