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/README.md

@@ -61,6 +61,10 @@ hydrotech-beam/
 - [CONTEXT.md](CONTEXT.md) — Full intake data
 - [BREAKDOWN.md](BREAKDOWN.md) — Tech Lead's technical analysis
 - [DECISIONS.md](DECISIONS.md) — All project decisions
+- [USER_GUIDE.md](USER_GUIDE.md) — Living user guide (operators + bots)
+- [playbooks/DOE.md](playbooks/DOE.md) — DOE execution playbook
+- [playbooks/NX_REAL_RUN.md](playbooks/NX_REAL_RUN.md) — Real NX run checklist
+- [playbooks/SYNCTHING_RECOVERY.md](playbooks/SYNCTHING_RECOVERY.md) — Sync recovery and cleanup
 - [kb/_index.md](kb/_index.md) — Knowledge base overview
 
 ## Team