docs: consolidate and update all documentation for launch readiness

- Rewrite root README.md with proper project overview, tech stack, and repo structure
- Remove duplicate CLAUDE.md files (root, onchain, ponder) — AGENTS.md is the standard
- Update HARBERG.md to reflect Stage 1 completion and Stage 2 evolution
- Delete stale onchain/testing_todos.md (all high-priority items completed)
- Update VERSION_VALIDATION.md for VERSION=2
- Trim root AGENTS.md: replace Docker duplication with docs/docker.md reference
- Trim onchain/AGENTS.md (129→71 lines): reference TECHNICAL_APPENDIX for formulas
- Trim web-app/AGENTS.md (278→55 lines): remove internal API docs, keep architecture
- Rewrite onchain/README.md: add contract table, deployment addresses, analysis links
- Trim services/ponder/README.md: remove stale subgraph comparison
- Add otterscan to docs/docker.md service topology
- Update TECHNICAL_APPENDIX.md references

Net: -388 lines across documentation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/docker.md

@@ -10,6 +10,7 @@ The Docker stack powers `scripts/dev.sh` using containerized services. Every boo
 - `webapp` – Vite dev server for `web-app` (port 5173)
 - `landing` – Vite dev server for landing page (port 5174)
 - `txn-bot` – automation loop plus Express status API (port 43069)
+- `otterscan` – block explorer UI (port 5100)
 - `caddy` – reverse proxy at `http://localhost:8081`, routing `/app/` → webapp, `/api/graphql` → ponder, `/api/rpc` → anvil, `/` → landing
 
 All containers mount the repository so code edits hot-reload exactly as the local script. Named volumes keep `node_modules` caches between restarts.