build: strip CBOR metadata footer for deterministic bytecode (#106)

Set `bytecode_hash = "none"` in foundry.toml so emitted bytecode no
longer contains the appended CBOR metadata block (IPFS source hash +
solc version marker). The IPFS hash covers source paths and dependency
layout, so the same source produced different bytes across clones —
this churn polluted genesis.json regenerations without changing any
runtime behavior.

The `solc = "0.8.30"` pin above is what actually fixes the compiler
version; the in-bytecode version marker was redundant artifact.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: Stumble

foundry.toml

@@ -6,6 +6,11 @@ out = "out"
 test = "test"
 libs = ["lib"]
 solc = "0.8.30"
+# Strip the CBOR metadata footer (IPFS source hash + solc version marker) from
+# emitted bytecode so genesis-baked contracts are byte-identical across clones,
+# dependency layouts, and machines. Compiler pin above is what's load-bearing;
+# the in-bytecode version marker is just an artifact.
+bytecode_hash = "none"
 cache = true
 cache_path = 'cache'
 optimizer = true