`GET /api/sessions/:id/last-response` branches to a Codex-specific reader, then
falls through to scanning `~/.claude/projects` for a transcript. OpenCode, Gemini
and Antigravity render their own TUIs and never write one, so that scan finds
nothing and the response viewer is permanently empty for all three modes.
For these CLIs the pane IS the transcript, so segment it. `response-viewer-transcript.ts`
is a pure, dependency-free parser that splits a terminal buffer into prompt /
response / status / tool blocks, keying off the `›` prompt marker, status
dividers and `• Calling|Called` tool-activity lines. The route uses it to answer
with the LAST response, and to carry the parsed blocks under `?context=full`.
Codex keeps its existing branch: it has real rollout files, which are a better
source than scraped pane text.
The response shape is unchanged for every other mode, and Claude panes are
explicitly pinned to the Claude transcript path so a real transcript can never
be shadowed by scraped text.
Tests: 14 parser cases plus a route suite covering all three modes, the
`?context=full` payload, an empty pane, and the Claude regression guard.