Full-Time Grandma T-Shirt Graphic

Create an original premium Etsy t-shirt graphic inspired by a “full-time grandma” boutique shirt design, but do not copy any existing listing exactly. Typography-only, center-stacked composition with this exact text and line breaks: "I'M NOT / RETIRED I'M / A FULL-TIME / GRANDMA." Use oversized bold instantly readable thumbnail-friendly lettering in a Bree Serif style, playful retro boutique typography, chunky rounded sans serif letters, slightly mismatched letter sizes, subtle uneven alignment, hand-set cut-paper feel, cheerful nostalgic energy, warm humorous premium giftable aesthetic, soft vintage vibe. Make every letter a different color using only 6 flat ink colors max: butter yellow, peach, coral orange, bubblegum pink, lilac, mint, aqua, on a garment-dyed seafoam / lime-cream / vintage teal shirt mock color context. Light distressed ink texture inside the letters only, clean edges, high contrast, screen-print / DTF friendly, no gradients, no metallic effects, no photographic textures. Tight stacked layout, balanced spacing, large chest-print format, transparent background, vector-clean look, 4500x5400 px, 300 dpi. No mockup, no person, no hanger, no floral clipart, no hearts, no border, no shadow, no extra icons, no brand logos, no watermark, no extra words beyond the quote. Negative prompt: misspelled text, warped letters, extra words, cursive-only font, thin strokes, low contrast, dark grunge, neon colors, black outlines, drop shadows, busy background, illustrations, flowers, hearts, mockup, person, hanger, watermark.