Institutional Vault Release v2.6.3

Institutional Vault: v2.6.3
Policy Nodes: v8.26.5
NATS: v2.6.3
configmap-init: v0.1.0

Audit and operations:
- Audit logs export as CSV instead of ZIP.

Policy workflow:
- Policy v2 retrieves transaction restriction function filter options dynamically from the policy service rather than a fixed list.

Wallet UI:
- Pending export transactions can be cancelled directly from the wallet interface.

Wallet and authentication:
- The wallet remains operational when the Canton driver is unavailable instead of failing to start.

Asset and chain identification:
- Solana transaction synchronization is more reliable.

Deployment and configuration:
- Corrected secret naming during tfvars file generation.
- The deprecated WithNoApprovalsGroups option is removed from policy node configuration.

Policy Nodes:
- Solana batch signing supports multiple nonce accounts per authority and multiple SOL transactions per batch.
- Canton testnet support uses CAIP-2 identifiers in the signing gateway in place of a separate testnet flag.