Replaces basic "service is up" checks with functional verification that tests can actually use the services.
## Changes
### New Health Checks
- **RPC Proxy**: Verifies eth_call works and deployed contracts are accessible
- **GraphQL**: Confirms Ponder has indexed data with non-zero stats
- **Web App**: Validates endpoint accessibility
### Improvements
- Clear error messages explain what failed and how to fix it
- Checks verify actual functionality, not just HTTP 200 responses
- Fails fast before tests run with cryptic errors
### Files
- `tests/setup/health-checks.ts` - Core health check functions
- `tests/setup/stack.ts` - Integration with waitForStackReady()
- `tests/HEALTH_CHECKS.md` - Documentation and troubleshooting guide
## Error Message Example
Before:
```
RPC health check failed with status 404
```
After:
```
❌ Stack health check failed
Failed services:
• RPC Proxy: RPC proxy returned HTTP 404
Expected 200, got 404. Check if Anvil is running and RPC_URL is correct.
• GraphQL Indexer: GraphQL has no indexed data yet
Ponder is running but has not indexed contract events.
Troubleshooting:
1. Check stack logs: tail tests/.stack.log
2. Verify services are running: ./scripts/dev.sh status
3. Restart stack: ./scripts/dev.sh restart --full
```
## Benefits
- ✅ Tests fail fast with clear error messages
- ✅ Catches configuration issues before tests run
- ✅ Verifies services are actually usable, not just running
resolves#61
Co-authored-by: johba <johba@harb.eth>
Reviewed-on: https://codeberg.org/johba/harb/pulls/65
