feat(progress): fix #93 reset player level

[Vicky08100]

Closes #93

Fixes #93 by adding an admin-only dispute resolution flow for resetting a player's progress level. The progress contract can now set a player to any target tier, preserve the existing progress history, append a new reset history entry, and emit a player_level_reset event so off-chain indexers can track the dispute action. This matters because fraudulent or mistaken milestone approvals can now be corrected without deleting audit history.

Changed

• Added reset_player_level(env, player_id, target_level) to the progress contract.
• Appended a new ProgressEntry for resets instead of deleting existing history.
• Added player_level_reset event with player_id, old_level, and target_level.
• Reused shared history-write logic for level advancement and admin resets.
• Added unit coverage for successful admin reset, emitted event, preserved history, and unauthorized reset.

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