Set up AI dev environment for recordingtest (#2)

- CLAUDE.md with collaboration rules and Planner/Generator/Evaluator cycle
- .claude/ agents, commands, skills, hooks per Claude Code conventions
- Sprint Contracts for sut-prober, normalizer, recorder, player, diff-reporter
- SUT catalog (EG-BIM Modeler, 187 plugins) and .gitignore excluding SUT tree
- PROGRESS.md / PLAN.md as shared agent handoff state
- Solution scaffold targeting sut-prober PoC

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

.claude/hooks/guard-sut-folder.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+# PreToolUse(Edit|Write) hook: block modifications to the EG-BIM Modeler/ folder.
+# The SUT binary tree is read-only from recordingtest's perspective.
+set -e
+
+input=$(cat)
+path=$(echo "$input" | jq -r '.tool_input.file_path // ""')
+
+case "$path" in
+  */EG-BIM\ Modeler/*|*"EG-BIM Modeler"*)
+    >&2 echo "🚫 EG-BIM Modeler/ is the SUT binary tree and must not be modified by recordingtest. Use docs/sut-catalog/ for derived data."
+    exit 2
+    ;;
+esac
+exit 0