feat: add vector graphics extraction with path verbs, CTM, and opacity support

CHANGELOG.md

@@ -12,6 +12,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **In-Memory PDF Opening** — `OpenFromBytes()`, `OpenFromBytesWithPassword()`, and context-aware variants for server-side workflows without temp file I/O (#68)
 - **Embedded Font Extraction** — `Document.GetEmbeddedFonts()` and `GetEmbeddedFontsForPage()` extract TTF/OTF font binaries from parsed PDFs for round-trip preservation (#67)
 - **LoadTTFFromBytes** — `fonts.LoadTTFFromBytes()` constructor for loading fonts from extracted binary data directly into Creator API
+- **Vector Graphics Extraction** — `Document.GetVectorGraphics()` and `GetVectorGraphicsForPage()` extract paths, bezier curves, colors, and opacity from parsed PDFs (#66)
+  - Path verb + coordinates model (MoveTo, LineTo, CubicTo, QuadTo, Close) compatible with gogpu/gg
+  - Graphics state stack (`q`/`Q`), CTM tracking (`cm`), CMYK→RGB conversion
+  - Stroke, fill, and fill-stroke paint modes with separate colors and opacity
+  - Line cap, line join, miter limit extraction
 
 ### Changed
 - **Parser Reader Refactor** — Internal `Reader` refactored from `*os.File` to `io.ReadSeeker` interface, enabling in-memory PDF support

README.md

@@ -385,6 +385,20 @@ for _, f := range fonts {
 }
 ```
 
+### Extracting Vector Graphics (NEW)
+
+```go
+doc, _ := gxpdf.Open("diagram.pdf")
+defer doc.Close()
+
+// Extract all vector paths with colors, opacity, and CTM-transformed coordinates
+paths, _ := doc.GetVectorGraphicsForPage(1)
+for _, p := range paths {
+    fmt.Printf("Path: %d verbs, mode=%v, stroke=%v, fill=%v\n",
+        len(p.Verbs), p.PaintMode, p.StrokeColor, p.FillColor)
+}
+```
+
 ### Extracting Tables from PDFs
 
 ```go