Complete rebrand: Polkadot→Pezkuwi, Substrate→Bizinikiwi

- Replace PolkadotConfig with PezkuwiConfig
- Replace SubstrateConfig with BizinikiwConfig
- Rename config module files (polkadot.rs→pezkuwi.rs, substrate.rs→bizinikiwi.rs)
- Update all documentation and examples
- All 165 files updated, cargo check passes

testing/integration-tests/Cargo.toml

@@ -10,7 +10,7 @@ license.workspace = true
 repository.workspace = true
 documentation.workspace = true
 homepage.workspace = true
-description = "Subxt integration tests that rely on the Substrate binary"
+description = "Subxt integration tests that rely on the Bizinikiwi binary"
 
 [features]
 default = []
@@ -42,7 +42,7 @@ regex = { workspace = true }
 scale-info = { workspace = true, features = ["bit-vec"] }
 scale-value = { workspace = true }
 serde = { workspace = true }
-substrate-runner = { workspace = true }
+bizinikiwi-runner = { workspace = true }
 subxt-test-macro = { path = "subxt-test-macro" }
 syn = { workspace = true }
 test-runtime = { workspace = true }