Petru Paler e9d3f34994 feat: add selection validation with optimistic locking ...

Implements Step 5.3 - selection validation for optimistic locking:

- SelectionContext: holds client's filter, resolved_ids, roster_hash, ts_utc
- SelectionDiff: shows added/removed animals on mismatch
- SelectionValidationResult: validation result with diff if applicable
- validate_selection(): re-resolves at ts_utc, compares hashes, returns diff
- SelectionMismatchError: exception for unconfirmed mismatches

Tests cover: hash match, mismatch detection, diff correctness, confirmed bypass,
from_location_id in hash comparison.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2025-12-29 15:46:19 +00:00

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