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

pipelines/curate.md

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+# Curation pipeline
+
+Version 0.1.0. Host-executed procedure for `kb-curate`.
+
+1. Define collection, audit type and budget. Record whether the requested output is a report or a contribution.
+2. Retrieve candidate records and their exact revisions; inspect evidence and existing relations.
+3. Classify stale, duplicate-candidate, contradiction, missing-link or insufficient-context findings. Explain the proposed change and its evidence. Similarity alone cannot decide a merge.
+4. For report-only work, stop with findings and coverage. For authorized contributions, build separate typed proposals with expected revisions and affected policy domains.
+5. Resolve validation findings and inspect receipts. A held merge or promotion is a pending exception; it is not permission to copy/delete records manually.
+
+Checkpoint candidate IDs, inspected revisions, findings, proposed changes and receipts. After another agent changes a candidate, re-inspect before resuming its proposal. Keep completed findings and unexamined coverage distinct.