docs: update KB and project docs with 2026-02-11 progress

- KB Gen 003: NX version (DesigncenterNX 2512), first real results
- sol101-static.md: path resolution lessons, in-place solving, result extraction confirmed
- CONTEXT.md: solver pipeline operational, first results (disp=17.93mm, stress=111.9MPa)
- DECISIONS.md: DEC-HB-008 to DEC-HB-011 (backup/restore, iteration arch, history DB, git workflow)
- optimization_engine/README.md: created (DesigncenterNX support, path resolution, NX file refs)
- studies/01_doe_landscape/README.md: updated architecture, iteration folders, history DB
- _index.md: closed gaps G3,G4,G6,G10-G14, updated generation to 003

projects/hydrotech-beam/CONTEXT.md

@@ -117,6 +117,19 @@ Minimize beam mass while meeting displacement and stress constraints. Single-obj
 - Idealized part: `Beam_fem1_i.prt`
 - Simulation: `Beam_sim1.sim`
 - Solver: NX Nastran SOL 101 (static structural)
+- **NX Version:** DesigncenterNX 2512 (Siemens rebranded NX → "DesigncenterNX")
+- **Install path:** `C:\Program Files\Siemens\DesigncenterNX2512` (on dalidou)
+
+## First Results (2026-02-11)
+
+| Metric | Value | Notes |
+|--------|-------|-------|
+| Displacement | **17.93 mm** | At baseline-ish DVs |
+| Von Mises stress | **111.9 MPa** | At baseline-ish DVs |
+| Solve time | **~12 s/trial** | On dalidou (Windows) |
+| Mass extraction | Via `p173` expression | Journal writes `_temp_mass.txt` |
+
+> Both constraints violated at baseline (disp > 10mm). Optimization will need to find stiffer/heavier designs or relaxed constraints.
 
 ## Future Expansion
 - Material alternatives: Aluminum 6061, Stainless Steel ANSI 310 (per Antoine, KBS session)
@@ -127,9 +140,24 @@ Minimize beam mass while meeting displacement and stress constraints. Single-obj
 - 2026-02-08: Project received from Antoine
 - 2026-02-10: KBS sessions processed → Gen 002 KB update. BCs confirmed.
 - 2026-02-10: Binary introspection — all expression names/values confirmed. Mass = 1,133.01 kg.
+- 2026-02-11: NX version fixed (DesigncenterNX 2512), path resolution bugs fixed, iteration architecture finalized (backup/restore in-place), history DB added. First real solve results.
 
 ## Status
-Phase: Baseline characterized — proceeding to optimization strategy finalization
-Generation: 002 (+ introspection corrections)
+Phase: **DOE execution** — solver pipeline operational, first results obtained
+Generation: 003
 Channel: #project-hydrotech-beam
-Last KBS session: 2026-02-10T16:38:01
+Last update: 2026-02-11
+
+### Solver Pipeline Status
+- ✅ NX journal solve working (DesigncenterNX 2512)
+- ✅ Mass extraction via `p173` expression
+- ✅ Displacement & stress extraction via pyNastran OP2 parsing
+- ✅ Iteration archival (params, results, OP2, F06)
+- ✅ History DB (SQLite + CSV, append-only, survives --clean)
+- ✅ Geometric pre-checks (hole overlap, web clearance)
+- 🔄 Full 51-trial DOE run pending
+
+### Development Workflow
+- **Git only** for development (git push/pull between server and dalidou)
+- **Syncthing paused** to avoid conflicts during active development
+- Resume Syncthing for production/delivery phases