chore: clean hydrotech-beam syncthing conflicts and add new docs

- Remove all .sync-conflict-* files
- Remove temp _temp_part_properties.json files
- Add USER_GUIDE.md
- Add dashboard docs (Executive, Technical, Operations, Master Plan)
- Add playbooks (DOE, NX_REAL_RUN, SYNCTHING_RECOVERY)
- Update iteration results

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

projects/hydrotech-beam/playbooks/NX_REAL_RUN.md

@@ -0,0 +1,38 @@
+# Playbook — NX Real Run (Hydrotech Beam)
+
+## Objective
+Run a **real** DOE using NX/Simcenter (not stub), with clean artifacts and traceability.
+
+## Pre-Run Checklist
+- [ ] In study folder: `...\studies\01_doe_landscape`
+- [ ] Model directory contains expected `.sim`, `.fem`, `.prt`
+- [ ] Syncthing healthy on both ends (no major errors)
+- [ ] No unintended `*.sync-conflict-*` in active results root
+- [ ] Command prepared with explicit `--backend nxopen`
+
+## Recommended command
+```powershell
+python .\run_doe.py --backend nxopen --model-dir "<PATH_TO_NX_MODELS>" --clean --study-name hydrotech_beam_doe_phase1_real
+```
+
+## During run — sanity checks
+- Runtime per solved trial should be non-trivial (not near-zero for all trials).
+- Log should indicate NX solve flow, not stub messages.
+- Iteration outputs should be created.
+
+## Post-run validation
+1. Check `results/doe_summary.json`
+2. Check `results/doe_results.csv`
+3. Verify:
+   - trial count expected (typically 51 for baseline + 50 LHS)
+   - solved/failed counts make sense
+   - mass values are numeric for solved trials
+   - no obvious synthetic patterns indicating stub run
+
+## Quality gate reminder
+Phase 1 gate (current):
+- ≥5 feasible points
+- ≥80% solve success
+
+## Mandatory logging
+Record the run in project docs using the run log template from `USER_GUIDE.md`.