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/session-start-progress.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# SessionStart hook: surface PROGRESS.md and PLAN.md so any agent can pick up work.
+set -e
+
+ctx=""
+for f in PROGRESS.md PLAN.md; do
+  if [ -f "$f" ]; then
+    ctx="${ctx}
+
+=== $f ===
+$(head -80 "$f")"
+  else
+    ctx="${ctx}
+
+=== $f ===
+(missing — run /handoff to bootstrap)"
+  fi
+done
+
+# Emit JSON so Claude Code adds it as additionalContext.
+jq -n --arg c "$ctx" '{
+  hookSpecificOutput: {
+    hookEventName: "SessionStart",
+    additionalContext: $c
+  }
+}'