Calculate commission based on sale amount, region, and agent tier.

[Danmax]

Action Pack:
Calculate commission based on sale amount, region, and agent tier.

• Base tiers (by amount, USD):
  < 1,000 → 3%
  1,000–4,999.99 → 5%
  5,000–49,999.99 → 7%
  ≥ 50,000 → 10%

• Region adders (percentage points):
  NA +5%, EMEA +6%, LATAM +4%, APAC +3%

• Agent tier adders (percentage points):
  Tier 1 +7%, Tier 2 +4%, Tier 3 +2%, Tier 4 +0%

  ===== Examples =====

calculateCommission(800, 'NA', 1);
-> { commissionRate: 0.15, saleAmount: 800.00, commissionAmount: 120.00, ... }
Explanation: 3% base + 5% NA + 7% Tier1 = 15%

calculateCommission(6000, 'EMEA', 2);
base 7% + EMEA 6% + Tier2 4% = 17%
=> commissionAmount = 6000 * 0.17 = 1020.00

calculateCommission(55000, 'APAC', 4);
base 10% + APAC 3% + Tier4 0% = 13%

[github-actions]

✅ Valid PR for ActionPack

Thank you for your contribution. This PR complies with the CONTRIBUTING.md.
A maintainer will review this shortly. In the meantime, Happy Hacking!

[SapphicFire]

Looks good to me! There are opportunities for these calculations to be based on a decision table using the Decision Table API