chore: clean up superproject structure

Move content to correct locations:
- AGENTS.md → .agents/AGENTS.md (with orchestrator reference update)
- third_party/docs/ (8 reference docs) → wiki/concepts/
- manuals/ (12 Node-RED docs) → wiki/manuals/

Delete 23 unreferenced one-off scripts from scripts/ (keeping 5 active).
Delete stale Dockerfile.e2e, docker-compose.e2e.yml, test/e2e/.
Remove empty third_party/ directory.

Root is now: README, CLAUDE.md, LICENSE, package.json, Makefile,
Dockerfile, docker-compose.yml, docker/, scripts/ (5), nodes/, wiki/,
plus dotfiles (.agents, .claude, .gitea).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

wiki/concepts/sources-readme.md

@@ -0,0 +1,21 @@
+# Source Documents
+
+Place actual scientific papers, standards, and technical manuals here. Reference them from the summary files in the parent directory.
+
+## Suggested Sources to Add
+
+- IWA Scientific and Technical Report No. 1 — ASM1 (Henze et al., 1987)
+- IWA Scientific and Technical Report No. 3 — ASM2d (Henze et al., 1999)
+- IWA Scientific and Technical Report No. 9 — ASM3 (Gujer et al., 1999)
+- Takacs et al. (1991) "A dynamic model of the clarification-thickening process" Water Res. 25(10), 1263-1271
+- Astrom & Hagglund (2006) "Advanced PID Control" ISA
+- Karassik et al. "Pump Handbook" McGraw-Hill
+- Europump/Hydraulic Institute "Pump Life Cycle Costs"
+- IEC 62443 series (OT security)
+- IEC 61298 series (process measurement)
+- EU Directive 91/271/EEC (Urban Waste Water Treatment)
+- NIST SP 800-82 Rev 3 (Guide to ICS Security)
+
+## File Naming Convention
+
+`<author-year>-<short-title>.pdf` — e.g., `takacs-1991-clarification-thickening.pdf`