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Pure-Swift codec for the sonar-sticker-pack-v1 wire format (\x1Fsticker\x1F<pack-coordinate>\x1F<shortcode>\x1F<sha256>), byte-identical to sonar-ffi, plus the wire spec doc and the reserved-not-advertised capability bit 13 note. No behavior change: nothing parses or routes sticker content yet (PRs B/C build on this). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>