[typotter]

Motivation

Define the distinction between a failed prerequisite and a prerequisite that evaluates successfully but produces no assignment.

A prerequisite returning DEFAULT without a variant makes its dependency condition not match. Evaluation may continue to a later root allocation. Missing flags and evaluation errors still fail the dependency graph.

Changes

• Add an unassigned prerequisite with no allocations.
• Add a dependent root that falls back when the prerequisite has no variant.
• Assert evaluation telemetry for both flags.
• Assert that only the root fallback exposure is published.

Decisions

• No assignment is represented by an absent variant, not a synthetic null variant.
• Both ONE_OF and NOT_ONE_OF conditions treat no assignment as non-matching.

Checklist

• JSON files are valid
• New test cases reference existing suite flags
• New flags have corresponding test cases
• Expected results match the flag configuration logic