docs: initialize project wiki from production hardening session

12 pages covering architecture, findings, and metrics from the
rotatingMachine + machineGroupControl hardening work:

- Overview: node inventory, what works/doesn't, current scale
- Architecture: 3D pump curves, group optimization algorithm
- Findings: BEP-Gravitation proof (0.1% of optimum), NCog behavior,
  curve non-convexity, pump switching stability
- Metrics: test counts, power comparison table, performance numbers
- Knowledge graph: structured YAML with all data points and provenance
- Session log: 2026-04-07 production hardening
- Tools: query.py, search.sh, lint.sh

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

wiki/tools/search.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+# Search the wiki — usable by both humans and LLM agents
+# Usage: ./wiki/tools/search.sh "query" [--files-only]
+
+WIKI_DIR="$(dirname "$(dirname "$(readlink -f "$0")")")"
+QUERY="$1"
+MODE="${2:---content}"
+
+if [ -z "$QUERY" ]; then
+    echo "Usage: $0 <query> [--files-only]"
+    exit 1
+fi
+
+if [ "$MODE" = "--files-only" ]; then
+    grep -rl --include="*.md" --include="*.yaml" "$QUERY" "$WIKI_DIR" 2>/dev/null | sort
+else
+    grep -rn --include="*.md" --include="*.yaml" --color=auto -i "$QUERY" "$WIKI_DIR" 2>/dev/null
+fi