docs: apply fleet-template (16-artifact scaffold)

Adds missing standard artifacts:
- README.md (if missing)
- AGENTS.md (AI agent contract)
- PLAN.md (current sprint)
- STATUS.md (where we are)
- DEVELOPMENT.md (dev workflow)
- DEPLOYMENT.md (deploy procedure)
- TESTING.md (test strategy)
- DECISIONS.md (ADR index + templates)
- .github/CODEOWNERS
- .github/workflows/ci.yml

Preserves all existing artifacts.

Refs: RugMunchMedia/fleet-template

CONTRIBUTING.md

@@ -0,0 +1,58 @@
+# Contributing to WalletPress
+
+WalletPress is open source (MIT). We welcome contributions of all kinds:
+bug fixes, new chain support, documentation, tests, and features.
+
+## Getting Started
+
+```bash
+git clone https://github.com/cryptorugmuncher/walletpress
+cd walletpress/backend
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt
+export WP_ADMIN_KEY=dev-key
+export WP_VAULT_PASSWORD=dev-pass
+uvicorn main:app --port 8010 --reload
+```
+
+## Code Standards
+
+- Python 3.10+ with type hints
+- Follow existing patterns (FastAPI, Pydantic v2, asyncio)
+- One PR per feature. Small commits with conventional messages
+- Add tests for new chain support (see `scripts/verify_test_vectors.py`)
+- No hardcoded secrets, no telemetry, no third-party data sharing
+
+## Adding a Chain
+
+1. Add chain config in `wallet_engine/chains.py`
+2. Add generation method in `wallet_engine/generator.py`
+3. Add balance fetching in `routers/balance_fetcher.py`
+4. Add test vector in `scripts/verify_test_vectors.py`
+5. Add to `supported_chains()` in the WP plugin
+
+## Verification
+
+All contributions must pass:
+```bash
+./venv/bin/python scripts/verify_test_vectors.py
+# Output: "ALL BIP39 VECTORS VERIFIED"
+```
+
+## PR Process
+
+1. Fork the repo
+2. Create a branch: `feat/add-zcash-support`
+3. Commit with conventional message: `feat: add Zcash (ZEC) wallet generation`
+4. Push and create PR
+5. Ensure CI passes (tests + format + type check)
+
+## Security
+
+Report vulnerabilities to security@walletpress.cc, not via public issues.
+We respond within 48 hours.
+
+## License
+
+By contributing, you agree your work is licensed under the MIT License.