1{
 2  "model_id": "saas_seed_v3",
 3  "namespace": "ndo.finance",
 4  "version": "1.0.0",
 5  "drivers": [
 6    {
 7      "id": "mrr",
 8      "category": "assumption",
 9      "type": "Currency(USD)",      // typed at compile time
10      "value": 8000,
11      "description": "Monthly recurring revenue, base period"
12    },
13    {
14      "id": "churn",
15      "category": "assumption",
16      "type": "Percentage",
17      "value": 0.06,
18      "feeds_into": ["net_retention", "ltv_cac"]
19    },
20    {
21      "id": "gross_profit",
22      "category": "computed",
23      "type": "Currency(USD)",
24      "formula": "revenue - cogs",   // AST-evaluated, no eval()
25      "depends_on": ["revenue", "cogs"]
26    }
27  ],
28  "assertions": [
29    {
30      "id": "cash_runway_ge_6mo",
31      "condition": "cash_runway_months > 6",
32      "severity": "structural"     // breaks ship-readiness, not compile
33    }
34  ],
35  "scenarios": [
36    { "id": "base" },
37    { "id": "downside_a17", "overlay": { "churn": 0.085, "new_logos_q": 8 } }
38  ]
39}