refactor(host-contracts): narrow canonical recompile scope and drop narration comments

Narrow compile:specific to KMSGeneration.sol (the only contract that
reads kmsGenerationAdd after the guard removal), avoiding a full
contracts/ recompile in the canonical path. Drop two narration-only
comments in deployCanonicalEmptyUUPSProxies.

Part of zama-ai/fhevm-internal#1268

Author: Eikix

host-contracts/tasks/taskDeploy.ts

@@ -58,8 +58,9 @@ task('task:deployCommonHostContracts').setAction(async function (_, hre) {
 
 task('task:deployCanonicalHostContracts').setAction(async function (_, hre) {
   await hre.run('task:deployCanonicalEmptyUUPSProxies');
-  // Recompile so that contracts importing kmsGenerationAdd pick up the new value.
-  await hre.run('compile:specific', { contract: 'contracts' });
+  // KMSGeneration reads its own address from the generated FHEVMHostAddresses.sol, so it must be
+  // recompiled after deployCanonicalEmptyUUPSProxies wrote kmsGenerationAdd.
+  await hre.run('compile:specific', { contract: 'contracts/KMSGeneration.sol' });
 
   await hre.run('task:deployKMSGeneration');
 
@@ -149,10 +150,7 @@ task('task:deployCanonicalEmptyUUPSProxies').setAction(async function (
   taskArguments: TaskArguments,
   { ethers, upgrades, run },
 ) {
-  // Ensure the addresses directory exists (may already be created by the common task on same run).
   ensureAddressesDirectoryExists();
-
-  // Compile the EmptyUUPS proxy contract if it has not been compiled in the common flow.
   await run('compile:specific', { contract: 'contracts/emptyProxy' });
 
   const privateKey = getRequiredEnvVar('DEPLOYER_PRIVATE_KEY');