Implement maintenance backoff and add planning wiki

[cpdata]

Summary

• introduce ROADMAP, PLANNING_THOUGHTS, and research/overview docs to capture strategy, decision context, and competitor insights alongside the existing source-of-truth materials
• add configurable maintenance retry controls and exponential backoff to meshmind/tasks/scheduled.py with supporting configuration, docs, and telemetry updates
• extend pytest coverage with REST/CLI smoke tests for /memories/counts plus retry-focused consolidation tests while refreshing README, docs, and planning files

Testing

• pytest

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https://chatgpt.com/codex/tasks/task_b_68ee1c9ee92c83218cbbebce8b0667b8