Implement Iterative Algorithm Loop

[RobinGummels]

Description:
Implement Step 9: Create the main algorithm loop that repeats the STAC query, data loading, NDSI calculation, and neighbor expansion until no additional candidate cells are found.

Tasks:

• Initialize queue with initial seed-containing candidates
• Implement while loop: while candidates_to_process > 0
• Process each candidate cell (Steps 3-8)
• Track processed cells to avoid reprocessing
• Add new candidates from neighbor expansion to queue
• Implement convergence check (no new candidates)
• Log progress (cells processed, candidates added)
• Implement timeout/max iterations safety mechanism
• Generate final classification map for all of Iceland

Acceptance Criteria:

• Algorithm iterates until convergence (no new candidates)
• All glacier-connected cells are identified
• No cells are processed twice
• Progress is logged at each iteration
• Final output covers all ice/snow regions in Iceland
• Performance metrics are collected (time, data volume)