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/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

projects/hydrotech-beam/playbooks/NX_REAL_RUN.md

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+# 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`.

projects/hydrotech-beam/playbooks/SYNCTHING_RECOVERY.md

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+# Playbook — Syncthing Recovery (Hydrotech Beam)
+
+## Symptoms
+- Latest run not visible on other side
+- Old timestamps persist remotely
+- `*.sync-conflict-*` files appear in `results/`
+
+## Recovery steps
+1. Confirm both sides point to the same folder path
+2. Rescan folder in Syncthing GUI
+3. Pause/resume folder if stale
+4. Restart Syncthing if needed
+5. Archive conflicts from active results root
+
+## Conflict archive snippet (PowerShell)
+```powershell
+$ts = Get-Date -Format "yyyyMMdd_HHmmss"
+$archive = ".\results\archive_conflicts_$ts"
+New-Item -ItemType Directory -Path $archive -Force | Out-Null
+Get-ChildItem .\results -File -Filter "*.sync-conflict-*" | Move-Item -Destination $archive
+```
+
+## Clean rerun prep snippet (PowerShell)
+```powershell
+$ts = Get-Date -Format "yyyyMMdd_HHmmss"
+$old = ".\results\archive_before_clean_rerun_$ts"
+New-Item -ItemType Directory -Path $old -Force | Out-Null
+
+$toArchive = @("doe_results.csv","doe_summary.json","doe_run.log","history.csv","history.db","optuna_study.db")
+foreach ($f in $toArchive) {
+  if (Test-Path ".\results\$f") { Move-Item ".\results\$f" $old }
+}
+```
+
+## Verification
+- Main `results/` has only current active artifacts
+- Conflict files moved to archive folder
+- Remote side sees same timestamps/files