Extracts candidate lessons from terminal tasks (confirmed, negative,
retest caution), gates them on cue + action + evidence, and makes
extraction idempotent through a per-source evidence key.
ARTEX_RSI_LESSONS selects off / shadow / inject. Shadow logs what would
have been shown; inject appends a code-owned, data-not-instructions block
after the planner and worker system prompts. No prompt mutation and no
adoption: status stays candidate.
Credit: the Library admission rule comes from harness2 (Google Research,
Apache-2.0, arXiv 2610.14224); the gain taxonomy from awesome-rsi
(lobehub).
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