[khvn26]

The identity key was resolved again for every feature evaluated, though it is the same throughout an evaluation. It is now resolved once, by evaluate_features and by the dependency resolver, and passed to a single flag result helper, _get_flag_result. get_flag_result_from_context is kept, resolving the key itself, so there is still only one implementation building flag results.

This is the identity key part of #296, rebased onto the current evaluator (variant keys, STATIC/DEFAULT reasons, dependent flags) without duplicating the flag result logic.

Effect: full evaluations 8–17% faster (environment and identity); single-feature evaluation unchanged.

Part of a stack of local evaluation performance PRs; see #353 for the stack and combined results. perf/all holds the whole stack for benchmarking.

[coderabbitai]

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