Add circle icon: solid disc primitive

r=15 disc, inset slightly from the 4..36 glyph bounds to sit at the
solid-glyph family's visual weight (checked in context against plus,
x, and the chevrons; a stroke-ring variant read as an O and clashed
with the search/refresh stroke language).

Co-Authored-By: Claude Fable 5 <[email protected]>

 svg/circle.svg | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/svg/circle.svg b/svg/circle.svg
new file mode 100644
index 0000000..d9413a9
--- /dev/null
+++ b/svg/circle.svg
@@ -0,0 +1,5 @@
+<svg width="40" height="40" viewBox="0 0 40 40" xmlns="http://www.w3.org/2000/svg">
+  <!-- Solid circle primitive (r inset slightly from the 4..36 glyph bounds
+       to balance the solid-glyph family's visual weight) -->
+  <circle cx="20" cy="20" r="15" fill="#f1fa8c" />
+</svg>