Tier-3 Calc Host conformance

Tier-3 Calc Hosts evaluate custom_calculations blocks (and the calculations declared by loaded modules) using the safe-expression language defined in UW_PROTOCOL_v1.md Part VIII.

A Tier-3 host MUST:

• Parse the safe-expression grammar exactly as specified (no eval, no arbitrary code execution).
• Resolve variable references via parser.deepGet semantics against the parsed file.
• Implement the built-in functions: sum, avg, npv, irr, pmt, if, coalesce, round.
• Be deterministic: same inputs → same outputs, every run.
• Surface CalcError objects per the taxonomy in Part XI.

Fixtures

fixtures/<scenario-id>/
├── deal.uw.md             Input deal file
├── calc.json              The calculation declaration to evaluate
└── expected-result.json   Expected CalcResult

Provided scenarios

Scenario	Tests
fixtures/revpar-basic	RevPAR = adr × occupancy with literal inputs from quick_metrics
fixtures/dscr-from-section	DSCR derived by deepGet path resolution across noi_model and debt_structure sections

Refinement scenarios

A separate refinement/ subdirectory exercises the dependency-graph extraction used by the v1.1 refinement engine (extractDependencyGraph from @uwmd/core/calc/dependencies):

refinement/<scenario-id>/
├── deal.uw.md             Input deal file
└── expected-graph.json    Expected projection of the dependency graph
                            (sorted maps and sets for stable comparison)

Scenario	Tests
refinement/dependency-graph-multifamily	Multifamily pack only (no custom_calculations); asserts the calc → input edge set matches the recorded shape

Run via:

node scripts/run-conformance.mjs --tier=3

Comparison strips the volatile evaluated_at timestamp from expected-result.json. The refinement scenario uses byte-exact comparison against expected-graph.json after sorting maps and sets.