docs: restore REUSE compliance by ignoring SPDX example in CLAUDE.md

The literal `SPDX-License-Identifier: Apache-2.0` shown as guidance in
the repository-conventions section was being parsed as a real license
tag, yielding an invalid SPDX expression and failing the public REUSE
compliance check. Wrap the line in `REUSE-IgnoreStart`/`REUSE-IgnoreEnd`
markers so the example renders verbatim without misleading the linter.

Author: suchapalaver

CLAUDE.md

@@ -70,7 +70,9 @@ The crate is sliced by feature flag and **modules in `lib.rs` are `#[cfg]`-gated
 ## Repository conventions
 
 - **Conventional Commits** are CI-enforced (commitizen); breaking changes use `!` or `BREAKING CHANGE:`.
+<!-- REUSE-IgnoreStart -->
 - **REUSE compliance** is CI-enforced — every source file needs `SPDX-FileCopyrightText` + `SPDX-License-Identifier: Apache-2.0` headers (see existing files for the pattern).
+<!-- REUSE-IgnoreEnd -->
 - **CHANGELOG.md** must be updated under `[Unreleased]` for user-visible changes.
 - **Releases** are tag-driven: bumping `Cargo.toml` + tagging `vX.Y.Z` triggers the crates.io publish workflow.
 - **Contract ABIs** in `abis/` are compiled into bindings at build time — regenerate bindings when ABIs change.