add what-it-does section to readme

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -8,6 +8,16 @@ Introducing **video-use** — edit videos with Claude Code. 100% open source.
 
 Drop raw footage in a folder, chat with Claude Code, get `final.mp4` back. Works for any content — talking heads, montages, tutorials, travel, interviews — without presets or menus.
 
+## What it does
+
+- **Cuts out filler words** (`umm`, `uh`, false starts) and dead space between takes
+- **Auto color grades** every segment (warm cinematic, neutral punch, or any custom ffmpeg chain)
+- **30ms audio fades** at every cut so you never hear a pop
+- **Burns subtitles** in your style — 2-word UPPERCASE chunks by default, fully customizable
+- **Generates animation overlays** via [Manim](https://www.manim.community/), [Remotion](https://www.remotion.dev/), or PIL — spawned in parallel sub-agents, one per animation
+- **Self-evaluates the rendered output** at every cut boundary before showing you anything
+- **Persists session memory** in `project.md` so next week's session picks up where you left off
+
 ## Get started
 
 ```bash
@@ -70,7 +80,7 @@ Transcribe ──> Pack ──> LLM Reasons ──> EDL ──> Render ──> S
                                                               └─ issue? fix + re-render (max 3)
 ```
 
-The self-eval loop runs `timeline_view` on the *rendered output* at every cut boundary — catches visual jumps, audio pops, hidden subtitles. You see the preview only after it passes.
+The self-eval loop runs `timeline_view` on the _rendered output_ at every cut boundary — catches visual jumps, audio pops, hidden subtitles. You see the preview only after it passes.
 
 ## Design principles