feat: add documentation, specifications, and pipeline configurations for GEWU agent system

agents/gewu/skills/kb-curate/SKILL.md

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+---
+name: kb-curate
+description: Audit a scoped GEWU collection for stale claims, duplicate candidates, contradictions and missing relationships, and propose authorized corrections with preserved history.
+---
+# Curate scoped knowledge
+
+Read the pack's [evidence](../../protocols/EVIDENCE.md), [scope](../../protocols/SCOPE.md) and [contribution](../../protocols/CONTRIBUTIONS.md) protocols, then use the [curation pipeline](../../pipelines/curate.md).
+
+Identify the requested audit and bound its collection/budget. For a report-only request, do not submit proposals. Inspect candidate nodes, source revisions, dates and relationships before recommending a change. Similarity nominates candidates; it does not prove duplicates. Preserve incompatible claims and explain the conditions under which they differ.
+
+For requested corrections, submit typed stale flags, supersession or relationship proposals supported by inspected records. Merges, promotion and protected changes follow their separate policy/owner gates. Never silently delete a node, rewrite canonical files or treat read scope as change authority.
+
+Report examined coverage, findings, proposed/accepted changes and unresolved exceptions. Unsupported curation tools remain unavailable; do not substitute raw SQL or filesystem edits.