[feat] export the prompt builders from the package index

[Thibaut-Fatus]

What

Three added lines in packages/benchmark/src/index.ts:

 export * from "./prompts/conversationToMechanismAssessmentPrompt.js";
+export * from "./prompts/conversationToNextMessagePrompt.js";
 export * from "./prompts/promptsFingerprint.js";
+export * from "./prompts/scenarioToFirstUserMessagePrompt.js";
+export * from "./prompts/scenarioToNextUserMessagePrompt.js";

Why

kora-infra's new run export produces a self-contained package for a run, which
includes a prompts/ folder with the full text of every prompt the run used:
the four target system prompts (adult + one per age band) and the two
user-simulator prompts, alongside the two judge prompts.

It renders those by calling the builders against a placeholder scenario. The
two judge builders were already exported from the index; these three were not,
so they are unreachable through the package's export map and the consumer does
not compile.

Purely additive — no signature change, no behaviour change, nothing else in the
file moves. The alternative was reaching past the export map into build/,
which would break the next time the build layout changes.

Note

kora-infra's submodule pointer needs to move to the merged commit once this
lands; its export branch is blocked until then.

🤖 Generated with Claude Code

https://claude.ai/code/session_01NExrgZ5EyiE2Ww9wP9RWMC