* fix: suppress spurious --native warning when set via env var
When AGENT_BROWSER_NATIVE=1 is set via environment variable, every
command after the first would warn:
⚠ --native ignored: daemon already running.
This is a false positive — the daemon was already spawned in native
mode and inherited the env var. The warning should only fire when
--native is explicitly passed on the CLI to an already-running daemon.
Add cli_native flag (consistent with existing cli_* pattern) to
distinguish CLI origin from env var origin.
* fix: add flag to test cfg
* fix: cli_native should track flag presence, not value
--native false on CLI should still warn when daemon is already
running, since the user is explicitly trying to change the mode.
Li Yang
eaa968e229