Dead-code sweep. Functions flagged unreachable by golang.org/x/tools/cmd/deadcode
and confirmed unused across pulse, pulse-enterprise, pulse-pro and pulse-mobile by
adversarial cross-repo verification. Cross-module reachability was checked
explicitly (only pkg/ exported symbols are importable by other modules; internal/
packages and _test.go files are not). go build, go vet and test-compile all pass.
Use stable control-plane user IDs as hosted tenant organization principals while preserving email as contact metadata and legacy fallback. Cloud handoff sessions now bind to the signed subject instead of email, seeded tenant orgs store owner/member email separately from durable user IDs, and the subsystem contracts pin that boundary.
