Add ACP-backed harness continuation#2046
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…chanism The turn half of the agent-programs work, stacked on the run half (feat/agent-programs). This commit restores the exchange surface carved out of that PR — the tree is byte-identical to the pre-split, fully validated state (feat/agent-programs-backup). - Agent.chat(task) -> ChatSession: the caller IS the run's user; one turn() per harness segment (the program runs to its exit, the caller answers, the next segment resumes the exchange with the answer). mask_prompt hides a scenario prompt from the wire while the task still scores the real row. - Harness.resume: relaunch on the accreted conversation by default (SUPPORTS_MESSAGE_PROMPT); codex overrides it with a native continuation (codex exec resume --last in a per-trace CODEX_HOME). - The user loop moves OUT of the model boundary: the old vf.User/Task.user in-boundary mechanism (session injection, dialect extend, serve_user, UserError, the -U scaffold, the placement matrix) is deleted — chat sessions in the env's rollout() are the one exchange mechanism. - textarena/alphabet-sort/color-codeword/wordle re-ported to session loops; user-sim bundled env (two-session relay, the tau-style substrate) and kuhn_poker_v1 (self-play reference) added. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Keeps the stacked tree current with its base: main's #2047 (prime image auto-builds) rides in through the base merge; pyproject re-bumps prime-sandboxes>=0.2.31 on top of this branch's kuhn-poker workspace member, and the lock is refreshed accordingly. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Overview
Adds public Agent Client Protocol support to v1 harnesses on top of the unified agent chat exchange in #2049.
Details
vf.ACPas the shared one-segment ACP transport.pi-acpadapter and native ACP session loading for Pi.