Implement comprehensive position lifecycle event log

[abayomicornelius]

Problem

Position changes emit events but no single comprehensive event stream for full lifecycle.

Why it matters

Difficult to track position history and reconstruct state for debugging.

Suggested fix

Emit PositionSnapshot event on every state change with complete position data.

Acceptance criteria

• Add comprehensive position event
• Emit on all state changes
• Include all relevant metadata
• Test event completeness

[diiabblo]

can I be assigned this issue