refactor: Complete project renaming from HARB/Harberger to KRAIKEN

- Updated all production code references from 'harb' to 'kraiken'
- Changed 'Harberger tax' references to 'self-assessed tax'
- Updated function names (_getHarbToken -> _getKraikenToken)
- Modified documentation and comments to reflect new branding
- Updated token symbol from HARB to KRAIKEN in tests
- Maintained backward compatibility with test variable names

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

onchain/README.md

@@ -66,7 +66,7 @@ forge script script/BaseSepoliaDeploy.sol:BaseSepoliaDeploy --slow --broadcast -
 
 if verification fails:
 ```shell
-forge verify-contract --watch --chain sepolia --constructor-args $(cast abi-encode "constructor(string,string,address,address,address)" "Harberger Tax" "HARB" "0x0227628f3F023bb0B980b67D528571c95c6DaC1c" "0xb16F35c0Ae2912430DAc15764477E179D9B9EbEa" "0x64dda11815b883c589afed914666ef2d63c8c338") 0x7517db0f2b24223f2f0e3567149ca180e204da8a Harb
+forge verify-contract --watch --chain sepolia --constructor-args $(cast abi-encode "constructor(string,string,address,address,address)" "Kraiken" "KRAIKEN" "0x0227628f3F023bb0B980b67D528571c95c6DaC1c" "0xb16F35c0Ae2912430DAc15764477E179D9B9EbEa" "0x64dda11815b883c589afed914666ef2d63c8c338") 0x7517db0f2b24223f2f0e3567149ca180e204da8a Kraiken
 
 forge verify-contract --watch --chain sepolia --constructor-args $(cast abi-encode "constructor(address)" "0x7517db0f2b24223f2f0e3567149ca180e204da8a") 0x00b4d656b8182d0c2f4841b7a6f1429b94f73a66 Stake
 ```
@@ -94,7 +94,7 @@ $ cast --help
 
 address: 0xf6a3eef9088A255c32b6aD2025f83E57291D9011
 
-### Harberg
+### Kraiken
 
 address: 0x22c264Ecf8D4E49D1E3CabD8DD39b7C4Ab51C1B8
 
@@ -109,7 +109,7 @@ address: 0x3d6a8797693a0bC598210782B6a889E11A2340Cd
 
 ## Deployment on Base
 
-### Harberg
+### Kraiken
 
 address: 0x45caa5929f6ee038039984205bdecf968b954820