[docs](trx-rs): update Improvement Areas wiki — mark resolved items
Update the Improvement Areas audit document to reflect all fixes implemented across PRs #58, #59, and #60. 22 items now marked as resolved; 5 remaining items reorganized by priority. https://claude.ai/code/session_01XzurkeuUmamBuhQwxVy7T4 Signed-off-by: Claude <noreply@anthropic.com>
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