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Ports PR #17888's send_multiple_images ABC to every gateway platform that has a native multi-attachment API, so images arrive as a single bundled message instead of N separate ones. Native overrides: - Telegram: send_media_group (10 photos per album, chunks over); animated GIFs peeled off and routed through send_animation (albums don't support animations) - Discord: channel.send(files=[...]) (10 attachments per message, chunks over); URL images downloaded into BytesIO so they render inline; forum channels use create_thread with files=[...] - Slack: files_upload_v2(file_uploads=[...]) (10 per call, chunks over); respects thread_ts; records thread participation - Mattermost: single post with file_ids list (5 per post — Mattermost cap, chunks over) - Email: single SMTP message with multiple MIME attachments (no chunk cap, SMTP size governs); remote URLs remain linked in body (parity with existing send_image) All platforms fall back to the base per-image loop on any failure, so a single bad image in a batch never loses the rest. Matrix, WhatsApp, and single-attachment platforms (BlueBubbles, Feishu, WeCom, WeChat, DingTalk) continue to use the base default loop — their server APIs only accept one attachment per message anyway. Tests: adds tests/gateway/test_send_multiple_images.py with 19 targeted tests covering base default loop, chunking, animation peel-off, fallback paths, and empty-batch no-ops across all five new overrides. Co-authored-by: Maxence Groine <maxence@groine.fr>