feat: upgrade to UniFFI 0.29.4 for iOS compatibility

- Updated uniffi, uniffi_build, and uniffi_bindgen to 0.29.4
- Added custom uniffi-bindgen binary for generating bindings
- Added bindgen-cli feature with camino and anyhow dependencies
- Regenerated Swift bindings with matching RustBuffer definition (uint64_t)

Author: BitcoinErrorLog

.cursorrules

@@ -0,0 +1,11 @@
+# Git and GitHub Rules (CRITICAL)
+
+## NEVER create, submit, or push pull requests (PRs) to any GitHub organization except BitcoinErrorLog.
+
+- NEVER push code, commits, or branches to synonymdev or any other organization
+- ONLY push to remotes that point to BitcoinErrorLog (e.g., `fork` remote pointing to `github.com/BitcoinErrorLog/*`)
+- When merging PRs from upstream (synonymdev), only merge locally and push to BitcoinErrorLog forks
+- NEVER use `gh pr create`, `gh pr comment`, or any GitHub CLI commands that would create/modify PRs outside BitcoinErrorLog
+- If unsure about a Git operation, verify the remote URL points to BitcoinErrorLog before pushing
+- Always check `git remote -v` before pushing to ensure you're pushing to the correct organization
+- Before any git push, verify the remote URL: `git remote get-url <remote-name>` must contain `BitcoinErrorLog`