docs: add SDK 0.x → 1.0 migration guide and codemods

[greatKhalifa-code]

• Add reference/migrating-to-v1.mdx with full symbol rename table, removed exports + workarounds, and behavioral changes (including Stellar SDK v13 memo API for Wave 6)
• Add reference/codemods/rename-evm-exports.js jscodeshift transform covering all five @wraith-protocol/sdk packages
• Add reference/codemods/README.md with usage instructions and post-codemod checklist
• Fix malformed Reference nav group in docs.json (duplicate pages key) and add migrating-to-v1 nav entry

closes #75

[drips-wave]

@greatKhalifa-code Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits

[truthixify]

Compile docs snippets is failing at the Check snippets step. This means one of your MDX code fences does not compile. Run pnpm check-snippets locally in the docs repo to see which specific snippet is broken. Common causes: importing a symbol that does not exist in the current SDK, or a fence tagged typescript/tsx when it is pseudo-code (tag it no-check in that case).