Added screenshots.

screenshots/README.md

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+# xtc screenshots
+
+Captured from the Phase 35 FLTK application on 2026-10-28, using a virtual X11
+screen. Images show actual rendered widgets, without mockups or image edits.
+
+[View the contact sheet](overview.png).
+
+The arrangement uses `examples/projects/modern-session.xtc`. The audio view adds
+a temporary generated waveform. Mixer automation and loop selections are staged
+for these captures. Plugin views use the repository's LADSPA, CLAP, VST2 and
+VST3 test fixtures; these are demonstration plugins, not commercial instruments.
+Preferences show application defaults and the staged loop. No user configuration
+or example project was overwritten.
+
+- [Sequencer loop](01-sequencer-loop.png)
+- [Mixer automation](02-mixer-automation.png)
+- [Modular graph](03-modular-graph.png)
+- [Piano roll velocity](04-piano-roll-velocity.png)
+- [Sequencer audio waveform](05-sequencer-audio-waveform.png)
+- [Preferences audio](06-preferences-audio.png)
+- [Preferences plugins](07-preferences-plugins.png)
+- [Preferences interface](08-preferences-interface.png)
+- [Preferences editing](09-preferences-editing.png)
+- [Preferences project defaults](10-preferences-project_defaults.png)
+- [Preferences transport](11-preferences-transport.png)
+- [Plugin library](12-plugin-library.png)
+- [Plugin descriptors](13-plugin-descriptors.png)
+- [Plugin controls](14-plugin-controls.png)
+- [Midi controller mapping](15-midi-controller-mapping.png)
+- [Loop range](16-loop-range.png)
+- [About](17-about.png)
+- [Audio clip properties](18-audio-clip-properties.png)
+- [Clap instrument descriptors](19-clap-instrument-descriptors.png)
+- [Vst2 instrument descriptors](20-vst2-instrument-descriptors.png)
+- [Vst3 instrument descriptors](21-vst3-instrument-descriptors.png)