Issue #3: non-interactive `--send` stdout presenter (design-brief §8b).
Composes sessions.create_session (when --new) with sse_client.stream_turn
+ cancel_turn. First contract in the repo with a code-level dependencies:
block (issues #1 and #2).
Six FN blocks (main, _parse_args, _amain, _render_event, _run_turn,
_cancel_and_log). 10 hard invariants codifying: no textual/rich imports;
Text deltas + post-Done newline are the only stdout writes; --session xor
--new + agent/api-key resolution chains; SIGINT semantics (cancel-with-
known-turn-id; early-exit code 3 without; swallow cancel failures during
drain). 9-bucket exit code table.
Volva paraphrase round flagged 5 ambiguities; all 5 amended:
- INV-001 wording: "no in-repo modules other than X/Y" (was strict-only)
- INV-002 + _render_event POST-002/003: Done's stdout newline is part
of the contract, restructured to avoid the "no other event writes
stdout" contradiction
- Data flow stderr list: added the pre-event [cancelled] (before any
event arrived) label
- _run_turn STEPS 3 race-loop: gate sigint_task creation behind
`if not cancelling` to avoid busy-wake once event is set; new
no_busy_loop_after_cancel trace test
- assumptions list: added CancelTurnNotFound + CancelAlreadyCompleted
prd: block pinned to issue #3 body SHA 206ef51709d43b2c at
2026-05-21T05:13:29+00:00. Drift check clean.
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