fix(pipeline): dedupe+P2002; add red maple-leaf cover system; replace dead CBC feeds (Google News CN / NatPost Canada); worker dead-letter

public/covers/canada.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 630" role="img" aria-label="Canada — MapleBrief"><defs><linearGradient id="bg" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#161614"/><stop offset="0.55" stop-color="#2b2b28"/><stop offset="1.3" stop-color="#45060c"/></linearGradient><pattern id="grid" width="48" height="48" patternUnits="userSpaceOnUse"><path d="M48 0H0V48" fill="none" stroke="#f8402f" stroke-opacity="0.10" stroke-width="1"/></pattern></defs><rect width="1200" height="630" fill="url(#bg)"/><rect width="1200" height="630" fill="url(#grid)"/><g fill="none" stroke="#f8402f" stroke-opacity="0.38" stroke-width="10" stroke-linecap="round" stroke-linejoin="round"><path d="M880 130L904 196L964 182L934 236L1006 250L948 296L1006 338L934 346L964 402L904 386L880 452L856 386L796 402L826 346L754 338L812 296L754 250L826 236L796 182L856 196Z"/><path d="M880 452V520"/></g><g fill="none" stroke="#f8402f" stroke-opacity="0.14" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"><path d="M700 452H1060"/></g><text x="80" y="556" font-family="Georgia, 'Times New Roman', serif" font-size="44" font-weight="700" fill="#ffd9d4" fill-opacity="0.92">Canada</text><text x="80" y="592" font-family="Inter, 'Segoe UI', sans-serif" font-size="18" letter-spacing="4" fill="#f8402f" fill-opacity="0.55">MAPLEBRIEF</text></svg>

public/covers/national.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 630" role="img" aria-label="National — MapleBrief"><defs><linearGradient id="bg" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#161614"/><stop offset="0.55" stop-color="#2b2b28"/><stop offset="1.3" stop-color="#45060c"/></linearGradient><pattern id="grid" width="48" height="48" patternUnits="userSpaceOnUse"><path d="M48 0H0V48" fill="none" stroke="#f8402f" stroke-opacity="0.10" stroke-width="1"/></pattern></defs><rect width="1200" height="630" fill="url(#bg)"/><rect width="1200" height="630" fill="url(#grid)"/><g fill="none" stroke="#f8402f" stroke-opacity="0.38" stroke-width="10" stroke-linecap="round" stroke-linejoin="round"><path d="M760 440V300M880 440V180M1000 440V300"/><path d="M850 180L880 120L910 180" stroke-width="7"/><path d="M782 300L760 268L738 300M978 300L1000 268L1022 300" stroke-width="7"/><path d="M760 380H1000M820 340H940" stroke-width="7"/></g><g fill="none" stroke="#f8402f" stroke-opacity="0.14" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"><path d="M700 440H1060M700 160H1060"/></g><text x="80" y="556" font-family="Georgia, 'Times New Roman', serif" font-size="44" font-weight="700" fill="#ffd9d4" fill-opacity="0.92">National</text><text x="80" y="592" font-family="Inter, 'Segoe UI', sans-serif" font-size="18" letter-spacing="4" fill="#f8402f" fill-opacity="0.55">MAPLEBRIEF</text></svg>

public/covers/top-stories.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 630" role="img" aria-label="Top Stories — MapleBrief"><defs><linearGradient id="bg" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#161614"/><stop offset="0.55" stop-color="#2b2b28"/><stop offset="1.3" stop-color="#45060c"/></linearGradient><pattern id="grid" width="48" height="48" patternUnits="userSpaceOnUse"><path d="M48 0H0V48" fill="none" stroke="#f8402f" stroke-opacity="0.10" stroke-width="1"/></pattern></defs><rect width="1200" height="630" fill="url(#bg)"/><rect width="1200" height="630" fill="url(#grid)"/><g fill="none" stroke="#f8402f" stroke-opacity="0.38" stroke-width="10" stroke-linecap="round" stroke-linejoin="round"><circle cx="880" cy="305" r="150"/><ellipse cx="880" cy="305" rx="64" ry="150"/><path d="M736 254H1024M730 356H1030"/></g><g fill="none" stroke="#f8402f" stroke-opacity="0.14" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"><path d="M700 155H1060M700 455H1060"/></g><text x="80" y="556" font-family="Georgia, 'Times New Roman', serif" font-size="44" font-weight="700" fill="#ffd9d4" fill-opacity="0.92">Top Stories</text><text x="80" y="592" font-family="Inter, 'Segoe UI', sans-serif" font-size="18" letter-spacing="4" fill="#f8402f" fill-opacity="0.55">MAPLEBRIEF</text></svg>