feat: v0.16.0 — Printavo::Enums namespace

[scarver2]

Summary

Adds Printavo::Enums — 18 frozen constant modules covering every consumer-facing enum in the Printavo V2 GraphQL schema (__DirectiveLocation and __TypeKind omitted as GraphQL introspection internals).

Module	Constants
ApprovalRequestStatus	APPROVED, PENDING, REVOKED, UNAPPROVED
ContactSortField	CREATED_AT, EMAIL, FIRST_NAME, LAST_NAME, UPDATED_AT
LineItemSize	XS–6XL, youth, toddler, infant, OS, NONE (26 values)
LineItemStatus	ACTIVE, CANCELLED
MerchOrderDeliveryMethod	LOCAL_DELIVERY, PICKUP, SHIP
MerchOrderStatus	CANCELLED, COMPLETE, PENDING, PROCESSING
MerchStoreStatus	ACTIVE, ARCHIVED, CLOSED
MessageDeliveryStatus	BOUNCED, DELIVERED, FAILED, PENDING, SENT
OrderPaymentStatus	PAID, PARTIAL, UNPAID
OrderSortField	CREATED_AT, CUSTOMER_DUE_AT, DUE_AT, UPDATED_AT, VISUAL_ID
PaymentDisputeStatusField	LOST, NEEDS_RESPONSE, RESOLVED, UNDER_REVIEW, WON
PaymentRequestStatus	CANCELLED, PAID, SENT
PoGoodsStatus	CANCELLED, PARTIAL, PENDING, RECEIVED
StatusType	INVOICE, QUOTE
TaskSortField	BODY, CREATED_AT, DUE_AT, UPDATED_AT
TaskableType	INVOICE, QUOTE
TransactionCategory	PAYMENT, REFUND
TransactionSource	CARD, CASH, CHECK, MANUAL, ONLINE

Each module exposes an ALL frozen array. A shared RSpec example ('a Printavo enum') validates all three structural invariants across every module.

Note: Values are best-effort against the live schema. Incorrect values should be reported as patch issues.

Usage

Printavo::Enums::ApprovalRequestStatus::APPROVED   # => "approved"
Printavo::Enums::OrderPaymentStatus::ALL           # => ["PAID", "PARTIAL", "UNPAID"]
Printavo::Enums::OrderSortField::VISUAL_ID         # => "VISUAL_ID"

Test plan

• bundle exec rspec — 701 examples, 0 failures, 100% line coverage
• bundle exec rubocop — 217 files inspected, no offenses

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