chore: remove alloy-op-hardforks crate (#88)

The alloy-op-hardforks crate has been moved to ethereum-optimism/optimism.
Git history and contributions have been preserved in the new location.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: theochap

Cargo.toml

@@ -36,7 +36,6 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [workspace.dependencies]
 alloy-hardforks = { version = "0.4.7", path = "crates/hardforks", default-features = false }
-alloy-op-hardforks = { version = "0.4.7", path = "crates/op-hardforks", default-features = false }
 
 # ethereum
 alloy-chains = { version = "0.2.0", default-features = false }

README.md

@@ -1 +1,9 @@
 # hardforks
+
+Ethereum hardfork definitions.
+
+## Announcement
+
+The `alloy-op-hardforks` crate has been moved to [ethereum-optimism/optimism](https://github.com/ethereum-optimism/optimism). It has been removed from this repository (`alloy-rs/hardforks`).
+
+Git history and contributions have been preserved in the new location.