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/dashboard/TECHNICAL_DASHBOARD.md

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+# Hydrotech Beam — Technical Dashboard
+
+Last updated (UTC): 2026-02-14T22:24:29
+Source: `studies/01_doe_landscape/results/doe_results.csv`
+
+## Study health
+- Trials: 51
+- Solved: 39
+- Geo-infeasible: 12
+- Solve failures: 0
+- Full-feasible: 0
+
+## Constraint status
+- Displacement limit: **10.0 mm**
+- Stress limit: **130.0 MPa**
+
+Observed solved ranges:
+- Tip displacement: **11.7788 → 39.4912 mm**
+- Max von Mises stress: **75.0116 → 398.4295 MPa**
+
+Feasibility counts:
+- Displacement feasible: **0**
+- Stress feasible: **23**
+- Fully feasible: **0**
+
+## Performance / runtime
+- Solve time range (solved): **12.42 s → 59.59 s**
+- Pattern indicates real NX execution (non-stub timing)
+
+## Data quality checks
+- Mass NaN (solved): **0** ✅
+- Penalty mass (99999): **12** (geo infeasible trials) ✅ expected
+- Mixed appended run state: **cleared** (current clean 51-trial set)
+
+## Technical interpretation
+- Current geometry space + 10 mm displacement limit appears too restrictive.
+- Stress limit is partially satisfiable (23/39), so the primary bottleneck is stiffness/displacement.
+
+## Recommended technical next actions
+1. Run a controlled DOE with displacement limit = 20 mm (exploration mode)
+2. Identify near-feasible stiff regions
+3. Launch TPE with penalty + staged tightening toward 10 mm
+4. Re-run gate check with updated feasible counts