## Contracts upgrade command with simple version tracking
This PR aims to take the most minimal changes from #438 to make the
upgrade command available.
So it adds the `bun cli contracts upgrade` command for deploying a new
`DataHavenServiceManager` implementation and upgrading the proxy, and
includes a simple version tracking via a `contracts/VERSION` file.
### Contracts
**`DataHavenServiceManager.sol`**
- Added `_version` storage variable
- Added `DATAHAVEN_VERSION()` view function,
- Added `updateVersion(string)` function gated by `onlyProxyAdmin`
- Added `VersionUpdated` event
- The version is set at initialization and updated atomically with proxy
upgrades via `upgradeAndCall`.
### CLI
**`bun cli contracts upgrade`** works in two modes: _dry-run_ or
_execute_.
**Dry-run (default)**
Deploys the new implementation on-chain (signed by the deployer key),
then prints a ready-to-submit JSON payload for the multisig to execute
the proxy upgrade. No AVS owner key required.
```bash
# Uses version from contracts/VERSION (standard workflow)
bun cli contracts upgrade --chain hoodi
# Override version for this upgrade only (warns if it differs from contracts/VERSION)
bun cli contracts upgrade --chain hoodi --target x.y.z
```
Example output:
```json
{
"to": "0xProxyAdmin...",
"value": "0",
"data": "0x...",
"description": "Upgrade ServiceManager proxy to 0xNewImpl... and set version to 1.1.0"
}
```
**Execute mode (`--execute`)**
Deploys the implementation and broadcasts the proxy upgrade + version
update in a single atomic `upgradeAndCall` transaction. Requires
`AVS_OWNER_PRIVATE_KEY`. Used mostly for testing.
```bash
bun cli contracts upgrade --chain anvil --execute
```
---
### Expected flow
- Bump mannually contracts/VERSION (e.g., 1.1.0)
- Run bun cli contracts upgrade --chain anvil|hoodi|mainnet
