feat: add insurance dynamic rule migration (surcharge + underwriting)

[cottonandcolor]

Summary

Adds two new commands to convert Insurance BRE dynamic rules to CML eligibility constraints:

• sf cml convert surcharge-rules — reads ProductSurcharge.RuleDefinition from org or JSON file
• sf cml convert underwriting-rules — reads UnderwritingRule.DynamicRuleDefinition from org or JSON file

Both convert ruleCriteria conditions into CML boolean constraints (eligibility-only, no actions), outputting .cml, _Associations.csv, and _RuleKeyMapping.json files. Import uses the existing sf cml import as-expression-set command.

Files added

• src/shared/insurance-rule-converter.ts — shared criteria→constraint conversion, product code resolution
• src/commands/cml/convert/surcharge-rules.ts — surcharge command
• src/commands/cml/convert/underwriting-rules.ts — underwriting command
• messages/cml.convert.surcharge-rules.md — help text
• messages/cml.convert.underwriting-rules.md — help text
• command-snapshot.json — updated with new commands

Context

Insurance dynamic rules (surcharge/underwriting) use the same ruleCriteria schema as Configurator rules but are stored on different entities (ProductSurcharge.RuleDefinition, UnderwritingRule.DynamicRuleDefinition) and are eligibility-only (pass/fail, no actions like AutoAdd/SetAttribute). The Insurance-Chewbacca team is adding CML support for surcharges in Core (W-21817142).

Example output

constraint Auto_WA_Tax = (product.id == "01tSB000004V4KLYA0" && Colour == "Red",
    "Surcharge eligibility: Auto_WA_Tax");

constraint DriverAccidentsLT2AndAutoConditionGood = (
    (product.id == "01tSB000004V4KpYAK" && Driver_Accident_Points < 2) ||
    (product.id == "01tSB000004V4KLYA0" && Auto_Value > 25000),
    "Underwriting eligibility: DriverAccidentsLT2AndAutoConditionGood");

Test plan

• Tested sf cml convert surcharge-rules against live org (6 rules converted)
• Tested sf cml convert underwriting-rules against live org (9 rules converted)
• Handles Attribute-type and Tag-type conditions (e.g., UserProfile)
• Resolves product codes from org when available, falls back to product IDs
• yarn build passes (lint + compile + snapshot)
• Import via sf cml import as-expression-set on a 264+ org with RuleEngineType field