feat: add Product Hunt badge and thumbnail

- Add Product Hunt featured badge to README below badges block
- Add assets/producthunt-thumbnail.png (240x240)
- Add scripts/gen_producthunt_thumbnail.py

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jakeefr

README.md

@@ -20,6 +20,12 @@
 
 </div>
 
+<div align="center">
+
+[![Product Hunt](https://api.producthunt.com/widgets/embed-image/v1/featured.svg?post_id=1123233&theme=dark&t=1776146492351)](https://www.producthunt.com/products/prism-24?utm_source=badge-featured&utm_medium=badge&utm_campaign=badge-prism-d6c1f55c-6f43-456f-bf84-790dbc1ad4ae)
+
+</div>
+
 ---
 
 ## The problem

assets/producthunt-thumbnail.png

@@ -0,0 +1,104 @@
+"""Generate a 240x240 Product Hunt thumbnail for PRISM.
+
+Run: python scripts/gen_producthunt_thumbnail.py
+Output: assets/producthunt-thumbnail.png
+"""
+from __future__ import annotations
+
+import math
+from pathlib import Path
+
+from PIL import Image, ImageDraw, ImageFont
+
+
+def glow_polygon(draw: ImageDraw.ImageDraw, pts: list, color: tuple) -> None:
+    r, g, b = color
+    draw.polygon(pts, fill=(r, g, b, 10))
+    draw.polygon(pts, outline=(r, g, b, 13), width=14)
+    draw.polygon(pts, outline=(r, g, b, 36), width=6)
+    draw.polygon(pts, outline=(r, g, b, 242), width=2)
+
+
+def glow_line(
+    draw: ImageDraw.ImageDraw,
+    p0: tuple,
+    p1: tuple,
+    color: tuple,
+    wide: int = 12,
+    mid: int = 5,
+) -> None:
+    r, g, b = color
+    draw.line([p0, p1], fill=(r, g, b, 18), width=wide)
+    draw.line([p0, p1], fill=(r, g, b, 45), width=mid)
+    draw.line([p0, p1], fill=(r, g, b, 220), width=2)
+
+
+def main() -> None:
+    W, H = 240, 240
+    BG = (13, 17, 23)
+    BLUE = (88, 166, 255)
+
+    img = Image.new("RGBA", (W, H), (*BG, 255))
+    draw = ImageDraw.Draw(img, "RGBA")
+
+    # --- Triangle ---
+    # apex top-center, base roughly at y=132
+    apex = (120, 18)
+    bl = (62, 134)
+    br = (178, 134)
+    glow_polygon(draw, [apex, bl, br], BLUE)
+
+    # Apex dot
+    ax, ay = apex
+    draw.ellipse((ax - 6, ay - 6, ax + 6, ay + 6), fill=(*BLUE, 20))
+    draw.ellipse((ax - 3, ay - 3, ax + 3, ay + 3), fill=(*BLUE, 230))
+
+    # --- Incoming white beam (left edge → left face midpoint) ---
+    left_mid = ((apex[0] + bl[0]) // 2, (apex[1] + bl[1]) // 2)  # ~(91, 76)
+    beam_start = (0, left_mid[1])
+    draw.line([beam_start, left_mid], fill=(255, 255, 255, 13), width=14)
+    draw.line([beam_start, left_mid], fill=(255, 255, 255, 25), width=6)
+    draw.line([beam_start, left_mid], fill=(255, 255, 255, 180), width=2)
+
+    # --- Refracted rays from right-face exit point ---
+    exit_pt = ((apex[0] + br[0]) // 2, (apex[1] + br[1]) // 2)  # ~(149, 76)
+
+    rays = [
+        ((248, 81,  73),  (240,  28)),   # red   – up-right
+        ((209, 134, 22),  (240,  52)),   # orange
+        ((210, 153, 34),  (240,  76)),   # yellow – near horizontal
+        ((63,  185, 80),  (240, 100)),   # green
+        ((88,  166, 255), (240, 122)),   # blue
+        ((188, 140, 255), (240, 142)),   # violet – down-right
+    ]
+    for color, end in rays:
+        glow_line(draw, exit_pt, end, color)
+
+    # --- Text ---
+    font_bold = ImageFont.truetype(r"C:\Windows\Fonts\consolab.ttf", 38)
+    font_tag  = ImageFont.truetype(r"C:\Windows\Fonts\consola.ttf",  13)
+
+    # "PRISM"
+    prism_text = "PRISM"
+    bb = draw.textbbox((0, 0), prism_text, font=font_bold)
+    tw = bb[2] - bb[0]
+    draw.text(((W - tw) // 2, 152), prism_text, font=font_bold, fill=(230, 237, 243, 255))
+
+    # "session intelligence"
+    tag_text = "session intelligence"
+    bb2 = draw.textbbox((0, 0), tag_text, font=font_tag)
+    tw2 = bb2[2] - bb2[0]
+    draw.text(((W - tw2) // 2, 201), tag_text, font=font_tag, fill=(139, 148, 158, 255))
+
+    # --- Save ---
+    out = Image.new("RGB", (W, H), BG)
+    out.paste(img, mask=img.split()[3])
+
+    out_path = Path(__file__).parent.parent / "assets" / "producthunt-thumbnail.png"
+    out.save(str(out_path), optimize=True)
+    size_kb = out_path.stat().st_size // 1024
+    print(f"Saved {out_path}  ({W}x{H}, {size_kb} KB)")
+
+
+if __name__ == "__main__":
+    main()