EXHIBIT R-6 · VOLUME WITHOUT SILENT DROPS

Synthetic Month 05 Heavy

Date: 2026-06-16
Status: PASS
Run artifact: runs/synthetic-month-05-heavy-full.json
Workflow: harness/synthetic-month-05-heavy.workflow.js

Month 05 is the volume gate. It asks whether Parka can handle a messy operating month without silently dropping ordinary rows while still catching the exception items that matter.

The fixture expands to 156 transactions: 36 fixed transactions plus 120 deterministic expansion rows across ordinary project supplies, SaaS microcharges, reimbursement recoveries, and bank/processor fees. The planted traps cover repeat remediation failures, refunds and chargebacks, mixed retail orders, asset capitalization, mixed-use transport, park-pass allocation, solo meals, and personal-value recurrence.

Result

PASS. The run classified 156/156 rows with:

• zero missing ids;
• zero duplicate ids;
• zero extra ids;
• zero target-count mismatch;
• zero expensive failures.

The scorer found all 18 must-catch items. It noted one cheap artifact gap: several correctly handled contested items were not all listed in referral_candidates, but their exception treatment was correct and no item was incorrectly deducted.

Deterministic Invariant

validateHeavyMonthEnvelope checks the fixture expansion and the classifier output:

{
  "expected_count": 156,
  "target_count": 156,
  "classified_count": 156,
  "missing": [],
  "duplicate": [],
  "extra": [],
  "target_mismatch": false,
  "complete": true
}

Cost

The local workflow run cost $1.14671745.

That is higher than a normal operating month because this was a stress run with 156 item-level classifications and a scored sealed-key pass. It is still an internal gate, not a recurring production shape.