- quotes.update: happy path with whitelisted fields, forbidden_field
rejection for system-controlled fields (status/customer/company/
quote_number/id), empty-patch rejection, missing-id rejection
- create_from_email: unit field now preserved end-to-end, result.items
returns the actual QuoteItem array (not just a count)
Also updates the existing tools/list test (now 72 tools, was 71) and
the create_from_email mock in route.test.ts to use the new
items/items_count shape so it matches the type.
All 1379 tests pass.
Co-authored-by: Orca <help@stably.ai>
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