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projects/hydrotech-beam/playbooks/DOE.md

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+# Playbook — DOE (Phase 1 Landscape)
+
+## Scope
+Design of Experiments for Hydrotech Beam: baseline + LHS samples to map design space.
+
+## Standard flow
+1. Prepare clean state (archive previous results if needed)
+2. Run DOE with explicit backend
+3. Validate outputs
+4. Evaluate gate criteria
+5. Decide next phase (rerun bounds/constraints or move to TPE)
+
+## Commands
+### Real engineering DOE
+```powershell
+python .\run_doe.py --backend nxopen --model-dir "<PATH_TO_NX_MODELS>" --clean --study-name hydrotech_beam_doe_phase1_real
+```
+
+### Debug DOE only (synthetic)
+```powershell
+python .\run_doe.py --backend stub --clean --study-name hydrotech_beam_doe_phase1_stub
+```
+
+## Interpretation checklist
+- `geo_infeasible` high: geometry bounds/checks may be too broad or too strict
+- `fully_feasible = 0`: constraints may be too strict for current design space
+- Very low runtime and suspiciously smooth outputs: likely stub execution
+
+## Decision branch
+- If gate passed: proceed to TPE seeded by feasible points
+- If gate failed:
+  - adjust constraints and/or DV bounds
+  - rerun clean DOE
+
+## Documentation requirement
+After each DOE run, update:
+- run record
+- decision and rationale
+- next action owner