Stage 1.1-1.3: reload_all include/exclude_jails params already implemented;
added keyword-arg assertions in router and service tests.
Stage 2.1/6.1: _send_command_sync retry loop (3 attempts, 150ms exp backoff)
retrying on EAGAIN/ECONNREFUSED/ENOBUFS; immediate raise on all other errors.
Stage 2.2: asyncio.Lock at module level in jail_service.reload_all to
serialize concurrent reload--all commands.
Stage 3.1: activate_jail re-queries _get_active_jail_names after reload;
returns active=False with descriptive message if jail did not start.
Stage 4.1/6.2: asyncio.Semaphore (max 10) in Fail2BanClient.send, lazy-
initialized; logs fail2ban_command_waiting_semaphore at debug when waiting.
Stage 5.1/5.2: unit tests asserting reload_all is called with include_jails
and exclude_jails; activation verification happy/sad path tests.
Stage 6.3: TestSendCommandSyncRetry (5 cases) + TestFail2BanClientSemaphore
concurrency test.
Stage 7.1-7.3: _since_unix uses time.time(); bans_by_jail debug logging with
since_iso; diagnostic warning when total==0 despite table rows; unit test
verifying the warning fires for stale data.
