Rule 09 (NEW): Intent Engineering / Escalation Triggers

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Source: Agents_Arcs audit, KNOWNO (arXiv:2307.01928), arXiv:2602.17753.
Define value hierarchy: constraint > task completion. Explicit escalation conditions per agent.
6 trigger classes: constraint conflict, ambiguity, irreversible action, low confidence, goal conflict, exceeding authorization.

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Corridor validation (Agents_Arcs harsh audit): Rule 05 corridor is behavioral, not structural — agents search outside because they have tool access. Fix: spawn subagents with notebook_id hardcoded and list_notebooks/search_notebooks physically absent from tool set.