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/commands/sut-probe.md

@@ -0,0 +1,19 @@
+---
+name: sut-probe
+description: Static probe of the EG-BIM Modeler SUT — enumerate plugins, snapshot Json/ configs, list engine assemblies. Does NOT launch the SUT.
+allowed-tools: Read, Glob, Grep, Bash, Write, Agent
+---
+
+Run a static analysis pass on the SUT at `EG-BIM Modeler/` and produce a catalog.
+
+Delegate to the `sut-explorer` subagent with this scope:
+
+1. List every plugin folder under `EG-BIM Modeler/Plugins/` and count them.
+2. Read each `EG-BIM Modeler/Json/*.json` and flag non-deterministic fields.
+3. List core assemblies (`HmEG*.dll`, `Editor*.dll`, `HmGeometry*.dll`) with file sizes.
+4. Write the catalog to `docs/sut-catalog/catalog.md` and `docs/sut-catalog/plugins.json`.
+5. Report a concise summary back here.
+
+Arguments (optional): $ARGUMENTS — if provided, restrict analysis to that subpath (e.g. `Plugins/EgBoxPlugin`).
+
+After the subagent reports, update `PROGRESS.md` with the catalog timestamp.