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build_prompt_rule_hint, build_tool_rule_hint and build_write_path_hint each ran the rule arm and then the via-lesson step by hand, the first two passing the query between them through a _via_query key on the payload. They now call one composer, _rule_moment, and the split helpers (_prompt_rule_hint, _tool_rule_hint, _add_rules_via_lessons) and the side channel are deleted. Output shapes are unchanged: the prompt builder returns no checkpoint key, the tool builder always does, and shown_rule_ids stays the direct band. A structural test pins that only _rule_moment runs a rule arm or the via-lesson step, and that the three builders are its only callers. plugin_context.py: 2,418 -> 2,361 lines this step; 3,558 when the milestone began. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>