feat(okf): add install.sh; changelog; e2e produce->validate->visualize verified

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

custom-skills/97-ourdigital-okf/install.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+# ourdigital-okf installer — symlinks the skill into ~/.claude/skills/ourdigital-okf
+set -e
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SKILLS_DIR="$HOME/.claude/skills"
+TARGET="$SKILLS_DIR/ourdigital-okf"
+
+mkdir -p "$SKILLS_DIR"
+if [ -e "$TARGET" ] || [ -L "$TARGET" ]; then
+  echo "Removing existing $TARGET"
+  rm -rf "$TARGET"
+fi
+ln -s "$SCRIPT_DIR" "$TARGET"
+echo "Linked $TARGET -> $SCRIPT_DIR"
+echo "Verifying scripts (stdlib-only)…"
+python3 "$SCRIPT_DIR/code/scripts/okf_validate.py" \
+  "$SCRIPT_DIR/code/scripts/tests/fixtures/mini_bundle" >/dev/null && echo "validate OK"
+echo "Done. Invoke with /ourdigital-okf"