Support `$.flags` context values in segment conditions

Support `$.flags..` conditions.

### Acceptance criteria

- The engine dependency is bumped to the version supporting `$.flags` context values.
- Identity-less evaluation passes segments to the engine so `$.flags` and `$.environment` conditions resolve.

Locate the engine dependency and the identity-less evaluation entry point, then inspect how segments are passed to the engine. Update the dependency to the version supporting $.flags context values and ensure identity-less evaluations pass segments so both $.flags and $.environment conditions resolve. Verify the acceptance criteria with the repository's existing test or check commands.

Written by the indexing model from the issue text.