Respond to PR review feedback with status summary

[Copilot]

Provides a comprehensive response to @rvagg's review comments, mapping which feedback items were addressed by @redpanda-f's recent commits.

Summary

Analyzed commits 3fe8052 through 9baab25 and cross-referenced with open review threads to document resolution status:

Addressed items (7 commits):

• Removed balance magic numbers by eliminating fields entirely
• Centralized path resolution through paths::devnet_info_file()
• Migrated error handling from unwrap_or_default() to Result with ok_or_else()
• Enhanced symlink test to verify actual behavior vs. stdlib internals
• Added zod schema validation with CI failure on invalid exports
• Removed dead formatBalance function
• Renamed curio_providers → pdp_sps for external consistency

Outstanding:

• Unit test for address derivation function
• Node.js version recommendation update (currently 18+)

No code changes made - this PR only adds the review response comment.

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