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/manuals/README.md

@@ -0,0 +1,10 @@
+# Manuals
+
+Local reference manuals used by EVOLV agents while implementing and reviewing Node-RED behavior.
+
+- `manuals/node-red/INDEX.md`: Node-RED manual index and quick usage map.
+- `manuals/node-red/runtime-node-js.md`: Runtime custom node message handling (`send`, `done`, multi-output arrays).
+- `manuals/node-red/function-node-patterns.md`: Function-node return/send patterns for output routing.
+- `manuals/node-red/messages-and-editor-structure.md`: Message shape and HTML/editor/runtime contracts.
+- `manuals/node-red/flowfuse-ui-chart-manual.md`: FlowFuse `ui-chart` data contract and runtime controls.
+- `manuals/node-red/flowfuse-dashboard-layout-manual.md`: Compact FlowFuse dashboard layout guidance.