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Two mechanisms landed together and hid each other: choosing a column by comparing a marked rendering against an unmarked one, and marking with private-use code points instead of `[[`. Either alone fixed the bracket repro, so neither had a mutation against it — the same masking the snippet's two column guards had a round ago. They do different jobs, so both stay and each gets the test that needs it. A transcript holding a private-use code point of its own is what the comparison is for; agent output carries Nerd Font glyphs from that block. A snippet past the character ceiling with a bracket after its last real mark is what the private-use marks are for, because the truncation has to find that mark by searching the text. The two one-line fixes get honest framing rather than a mutation neither can have. A lone surrogate is not a token character, so the planner drops it either way and the safe cut is hygiene. And no SQLite this stack runs refuses 1,100 bound ids — 32,766 has been the floor since 3.32 — so the batch is about owning the ceiling here rather than rescuing a reachable failure.