Add upgrade e2e test and fix PackageUpgradedEvent parsing

Adds an end-to-end test that exercises the full governance-gated upgrade
lifecycle and verifies cascading effects across the stack.

The test found a real bug: PackageUpgradedEvent was missing from
HashiEvent::try_parse(), so validators never learned about package
upgrades via the event stream. Fixed by adding the missing match arm.

Test flow:
- Deposit before upgrade, verify balance survives (state continuity)
- Upgrade via propose/vote/execute+publish+finalize
- Verify all node watchers pick up the new package version
- Deposit after upgrade through full validator confirmation path
- Call v2-only canary module (new code reachable)
- Disable v1, verify entry points rejected

Author: Bridgerz

crates/e2e-tests/src/lib.rs

@@ -23,6 +23,8 @@ pub mod e2e_flow;
 pub mod hashi_network;
 mod publish;
 pub mod sui_network;
+pub mod upgrade_flow;
+pub mod upgrade_tests;
 
 pub use bitcoin_node::BitcoinNodeBuilder;
 pub use bitcoin_node::BitcoinNodeHandle;
@@ -69,6 +71,10 @@ impl TestNetworks {
         &self.bitcoin_node
     }
 
+    pub fn dir(&self) -> &Path {
+        self.dir.path()
+    }
+
     pub async fn restart(&mut self) -> Result<()> {
         self.hashi_network.restart().await
     }