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Introduces a reusable feature flag framework so future features can adopt flags without writing infrastructure code. Backend: server/pkg/featureflag (Go) - Service / Provider / Decision separation per Martin Fowler's Toggle Point / Toggle Router / Toggle Configuration pattern. - Providers: StaticProvider (rules in source control), EnvProvider (FF_<KEY> overrides for ops kill switches), ChainProvider (first-hit-wins composition). - EvalContext carried through context.Context with WithEvalContext / EvalContextFrom; supports user_id, workspace_id, free-form attributes. - PercentRollout via deterministic FNV-1a bucketing; same user always lands in the same bucket so experiments do not flap between requests. - Nil-safe Service: a nil *Service or missing flag returns the caller's default so business code never panics on a missing flag. - 100% unit-test coverage with -race; go vet clean. Frontend: packages/core/feature-flags (TypeScript) - Same vocabulary as the Go side (Decision, EvalContext, Rule, PercentRollout). FNV-1a parity ensures cross-tier bucket agreement. - FeatureFlagService + StaticProvider + ChainProvider in pure TS. - React glue: FeatureFlagsProvider, useFlag(key, default), useVariant(key, default). Hooks fall back to the default when no provider is mounted so Storybook / unit tests stay simple. - Vitest tests for service, providers, hash, and React hooks. Docs: docs/feature-flags.md — wiring, EvalContext, toggle points, backend-protection note, and the standard best-practice checklist. The framework intentionally has no third-party Go deps and no API surface beyond what real callers will need. New providers (DB, remote config, LaunchDarkly) plug in by implementing Provider; no existing caller has to change. Co-authored-by: multica-agent <github@multica.ai>