Add -reset command to letsgo script

[AlanRuno]

Summary

Adds a -reset command to the letsgo script that allows users to reset all node data, including:

• Peer table data
• Rapid stake table data
• Blockchain data (blocks, UTXO database)
• DHT state files

Usage:

./letsgo -reset              # Reset data only (with confirmation prompt)
./letsgo -reset ./data       # Reset data in specified directory
./letsgo testnet -reset      # Reset data, then build and run on testnet
./letsgo mainnet -reset      # Reset data, then build and run on mainnet

The standalone -reset command includes a confirmation prompt before deletion. When used with testnet or mainnet, the confirmation is skipped since the user explicitly requested the reset.

Updates since last revision

• Added support for ./letsgo testnet -reset syntax to reset data and start the node in one command
• When used with testnet/mainnet, confirmation prompt is skipped (reset happens automatically after build, before node starts)
• Refactored reset function to use return instead of exit so it can be called inline
• Bug fix: Filter out -reset/--reset flags from arguments passed to mxd_node (was causing node to fail with usage error)

Review & Testing Checklist for Human

• Test ./letsgo testnet -reset workflow: Verify reset happens after build but before node starts, and node initializes fresh (this was broken before the filtering fix)
• Verify default data directory path: The reset targets ./build/lib/data - confirm this matches where deployed nodes actually store their data (check data_dir in config)
• Test the glob patterns: Ensure *.json, *.dat, *.bin patterns don't accidentally match config files that should be preserved
• Verify no-confirmation behavior: When using testnet -reset, confirm that data is deleted without prompting (this is intentional)

Recommended Test Plan

1. Run a node to generate some data in the data directory
2. Run ./letsgo testnet -reset and verify:
   • Build completes successfully
   • Data is reset without confirmation prompt
   • Node starts fresh without errors (no "Usage:" error message)
3. Also test standalone ./letsgo -reset to verify confirmation prompt still works

Notes

• The script uses rm -rf for database directories - this is intentional but destructive
• The confirmation prompt is only shown for standalone -reset, not when combined with testnet/mainnet

Link to Devin run: https://app.devin.ai/sessions/f0a6357d898e440ea3745d77dfb91d8d
Requested by: Runo (runonetworks@gmail.com) / @AlanRuno

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