Remove three groups of copy-pasted code in openshell-server:
1. grpc/mod.rs had a private current_time_ms() wrapper identical to the
one already exported from persistence/mod.rs. Remove the duplicate
and update the three grpc sub-modules (policy, sandbox, service) to
import directly from crate::persistence.
2. test_store() was repeated verbatim in seven #[cfg(test)] blocks.
Promote a single canonical version to persistence/mod.rs (cfg-gated)
and replace all copies with crate::persistence::test_store() calls or
a thin Arc wrapper in supervisor_session.
3. grpc_client_mtls() and build_tls_root() were copy-pasted across
edge_tunnel_auth.rs and multiplex_tls_integration.rs. Move both into
the existing tests/common/mod.rs shared module and import from there.
Remove ~280 lines of duplicated code across 30 files in 5 areas:
- centered_rect: consolidate 5 identical TUI layout helpers into a
single pub fn in openshell-tui/src/ui/mod.rs
- server test helpers: replace ~100 inline Store::connect() calls
with local test_store() helpers; deduplicate test_server_state()
in grpc/service.rs to use the shared test_support version
- rogue PKI: extract 20-line rogue CA+client cert generation block
(duplicated in two integration tests) into generate_rogue_pki()
in tests/common/mod.rs
- provider tests: replace 8 identical 28-line test modules with a
single macro_rules! test_discovers_env_credential! invocation
- label constants: centralize openshell.ai/ container label keys
in openshell-core::driver_utils; update Docker and Kubernetes
drivers to import from there instead of redefining them locally