'workspace_booking::is_slot_available` performs an O(n) scan over all workspace bookings

[Nabeelahh]

Area: Smart Contract

• Description: For a workspace with many historical bookings, the availability check iterates every booking ID in WorkspaceBookings. This could hit Soroban instruction limits at scale. Consider pruning completed/cancelled bookings from the index or storing only active booking IDs.
• File(s): contracts/workspace_booking/src/lib.rs, contracts/workspace_booking/src/test.rs
• Priority: Medium
• Implementation & verification: Treat this as a protocol-safety change: check authorization, storage/ABI compatibility, ledger-time behavior, and emitted events before changing the implementation. Add a contract-level regression test for both the invalid and successful paths.
• Affected files (2–6): contracts/workspace_booking/src/lib.rs, contracts/workspace_booking/src/test.rs
• Work distribution: Implementation: contracts/workspace_booking/src/lib.rs. Integration: update the directly connected public interface only where required. Verification: contracts/workspace_booking/src/test.rs.

[Spectre-crypto540]

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