Include item identifiers in Sales Order Agent searches

[qasimikram]

Summary

• Include item numbers, SKUs, product codes, vendor item numbers, and catalog numbers in item search text when provided
• Preserve item identifiers exactly, including punctuation
• Continue normalizing spelling and singular forms only for descriptive keywords
• Prevent description-only searches when the request contains an item identifier

AB#641231

[PredragMaricic]

Approved with suggestions:

S1 - Require the identifier to be the first search term. SOAItemSearch.GetItemFilters treats only the first search keyword as a potential exact Item."No." lookup. Update the prompt to require the identifier first so descriptive terms cannot bypass the deterministic exact-match path.

S2 - Add regression evaluation evidence for an order line containing an identifier plus a noisy or mismatched description. Verify that search preserves the identifier, places it first, and selects the exact item; compile and unit-build checks do not establish prompt behavior.

S3 - Clarify requirement traceability. AB#641231 covers replacing Document Intelligence with direct model document reading, but its acceptance metrics do not specify identifier-search behavior. Link the specific requirement or document the relevant acceptance criterion and validation in this PR.