docs(P4): metrics catalog + NORTH_STAR integration + trust snapshot + no-humans thesis (REQ-186,191..195,204,210..213)

P4 (Wave 3, docs) — REQ-186, 191, 192, 193, 194, 195, 204, 210, 211, 212, 213

New docs:
- docs/METRICS.md — canonical KPI catalog (grounded/derived/deferred)
- docs/metrics/*.md — 13 per-KPI definition-of-success docs (D-127)
- docs/METRICS_DEFERRED_ROADMAP.md — 8 deferred metrics + hot-path plan + re-eval triggers (REQ-210)
- docs/NO_HUMANS_THESIS.md — thesis defensibility brief (REQ-213)

New tools:
- core/metrics/trust_snapshot.py — 5 trust metrics + chain-integrity verdict + snapshot hash (REQ-211)
- scripts/check_north_star_diff.sh — CI check for NORTH_STAR strategic section changes (REQ-204)

Modified:
- .ciagent/config.json — strategic_direction_file: .ciagent/NORTH_STAR.md (REQ-186)

---ci---
project: acdl
phase: 4
milestone: v1.17
status: execute
---/ci---

scripts/check_north_star_diff.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+# Nova NORTH_STAR diff-check (REQ-204).
+#
+# Fails when the Vision, Strategic Objectives, Anti-Goals, or 12-18mo
+# Targets sections of .ciagent/NORTH_STAR.md change without a
+# NORTH_STAR-CHANGE: commit trailer in the latest commit message.
+#
+# Usage: bash scripts/check_north_star_diff.sh
+# Returns 0 on pass, 1 on fail.
+
+set -euo pipefail
+
+NORTH_STAR=".ciagent/NORTH_STAR.md"
+SECTIONS_REGEX='^## (Vision|Strategic Objectives|Anti-Goals|12.*18 Month Targets)'
+
+if [ ! -f "$NORTH_STAR" ]; then
+    echo "WARN: $NORTH_STAR not found — skipping diff-check"
+    exit 0
+fi
+
+# Get the diff of NORTH_STAR.md in the latest commit
+DIFF=$(git diff HEAD~1 -- "$NORTH_STAR" 2>/dev/null || true)
+
+if [ -z "$DIFF" ]; then
+    # No changes to NORTH_STAR.md — pass
+    exit 0
+fi
+
+# Check if any of the strategic sections changed
+SECTION_CHANGES=$(echo "$DIFF" | grep -E '^\+## (Vision|Strategic Objectives|Anti-Goals|12.*18 Month Targets)' || true)
+LINE_CHANGES=$(echo "$DIFF" | grep -E '^[+-]' | grep -v '^[+-]{3}' | head -50 || true)
+
+# Simple heuristic: if lines under the strategic sections changed
+CHANGED_SECTIONS=""
+CURRENT_SECTION=""
+while IFS= read -r line; do
+    case "$line" in
+        "+## Vision"*) CURRENT_SECTION="Vision" ;;
+        "+## Strategic Objectives"*) CURRENT_SECTION="Strategic Objectives" ;;
+        "+## Anti-Goals"*) CURRENT_SECTION="Anti-Goals" ;;
+        "+## 12"*) CURRENT_SECTION="12-18mo Targets" ;;
+        "+## "*) CURRENT_SECTION="" ;;
+    esac
+    if [ -n "$CURRENT_SECTION" ] && [ -n "$line" ] && [[ "$line" == +* ]] && [[ "$line" != "+## "* ]]; then
+        CHANGED_SECTIONS="$CHANGED_SECTIONS $CURRENT_SECTION"
+    fi
+done <<< "$DIFF"
+
+if [ -z "$CHANGED_SECTIONS" ]; then
+    # No strategic section changes — pass
+    exit 0
+fi
+
+# Check for the NORTH_STAR-CHANGE: commit trailer
+COMMIT_MSG=$(git log -1 --format='%B')
+if echo "$COMMIT_MSG" | grep -q "NORTH_STAR-CHANGE:"; then
+    echo "OK: NORTH_STAR strategic sections changed with NORTH_STAR-CHANGE: trailer"
+    exit 0
+fi
+
+echo "FAIL: NORTH_STAR strategic sections changed without NORTH_STAR-CHANGE: commit trailer"
+echo "Changed sections:$CHANGED_SECTIONS"
+echo "Add 'NORTH_STAR-CHANGE: <description>' to the commit message and re-commit."
+exit 1