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4818d1cbbb
Quality review caught a real bug in the previous commit. The `CodeBlockVariantContext` provider was mounted inside `MessageActivity`, which only handles assistant items — `UserMessageBubble` returns before it. A fence inside a human prompt therefore kept the legacy 16px muted frame, nested inside the new 12px prompt bubble. The recipe is a property of the *surface*, not of a role: a fenced block in a prompt should read the same as one in a reply. The provider moves up to `AgentSessionTranscriptList`, alongside the variant and turn-meta providers, so every descendant markdown render inherits it. It still renders no DOM, so `default`/`compactPreview` markup stays byte-identical and the baseline fixture is unchanged. Added a fenced-prompt test, which the existing fenced test could not catch because it only rendered an assistant item. Proven non-vacuous two ways: pinning the boundary provider to `default` fails both fenced tests, and re-adding a role-scoped `default` provider around only the user bubble's markdown fails the new prompt test alone. Also renamed `channel-message code blocks are untouched by the focus recipe` to `the default transcript variant keeps the legacy code chrome`. It renders the `default` transcript variant, not a channel message row, so the old name claimed a contract it did not prove. AGENTS.md gains the `assert.equal(el, null)` note: that form serializes the matched element's whole subtree to build a failure diff and OOMs the runner instead of printing the message, which made a genuine failure unreadable. Use `assert.ok(x === null)`. Verified at this tree: full desktop suite 5428 passing / 0 failing, `tsc --noEmit` clean, `biome check` at main's baseline, px-text / pubkey-truncation / file-size clean. Screenshots captured light and dark by temporarily pinning `transcriptVariant="conversation"` in `AgentSessionThreadPanel`; that pin is dev-00's slice and is not in this commit. Signed-off-by: ss-dev-01 <11939edb7df583f855dbef923f2358f1184538f88ca452e19e7e35e42ad6d796@buzz.block.builderlab.xyz> Co-authored-by: Bradley Axen <baxen@squareup.com> Signed-off-by: Bradley Axen <baxen@squareup.com>