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

pipelines/query.md

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+# Query pipeline
+
+Version 0.1.0. Read-only host-executed procedure for `kb-query`.
+
+1. Establish question, explicit scope and answer budget; inspect actual service availability.
+2. Retrieve accepted candidates with complete citation groups, scope and index metadata. Preserve degraded-mode and freshness warnings.
+3. Inspect decisive nodes/source locations and bounded typed neighbors. Keep suggestions and established relationships distinct.
+4. Compose an answer with citations near factual claims, relevant conditions, disagreements and as-of dates. Report insufficient evidence without filling gaps from memory as if retrieved.
+5. Record the retrieved revision IDs and omissions when a resumable local work record is needed. Do not create a server mutation merely to log a read-only query.
+
+Stop when the requested question is answered within its budget or a named evidence/service gap prevents it. A changed question/scope starts a new retrieval, rather than silently reusing incompatible prior results.