chore: add impl-only deploy script for MoolahVaultManager (BSC mainnet)

[ricklista]

Summary

Adds an impl-only Foundry deploy script for MoolahVaultManager on BSC mainnet. Deploys a fresh MoolahVaultManager implementation (constructed with the production Moolah address) for later proxy wiring via a timelock upgrade.

Change type

• Migration / deploy script

Contracts changed

File	Type
script/deploy_moolahVaultManager_impl.sol (MoolahVaultManagerImplDeploy)	new

Interface changes

None — script only; no protocol contract modified.

Storage layout

N/A — deploy script, not an upgradeable contract.

Access control

Unchanged. Script broadcasts from the auto-selected deployer key (_deployerKey() from DeployBase).

Risk assessment

Area	Risk	Note
Storage collision	🟢 None	No storage; impl deploy only
Fund safety	🟢 None	Deploys an unwired implementation; no funds touched
Access control	🟢 None	No role/owner changes
External call safety	🟢 None	Only new MoolahVaultManager(moolah)

Deployment

• Chain: BSC mainnet
• Script: script/deploy_moolahVaultManager_impl.sol
• Moolah: 0x8F73b65B4caAf64FBA2aF91cC5D4a2A1318E5D8C (hardcoded)
• Deployer key auto-selected by chain ID. Impl is inert until a separate timelock proxy upgrade points the proxy at it.

Test plan

• Script compiles (forge build script/deploy_moolahVaultManager_impl.sol --via-ir)
• Deploy on BSC mainnet and record impl address; wire via timelock upgrade runbook (out of scope for this PR)

🤖 Generated with Claude Code

[razww]

LGTM