aligned with `make clean` — ignores compiled binaries (tx/rx/chat/bt/
carrier, test/{unit,integration,functional}), object files, and the
generated blog output under web/blog/.
recovered code verified at this commit:
make all : 5 binaries built, no -Wall/-Wextra warnings
test/unit : 84/84 passed
test/integration : 17/17 passed (benchmark: 836 baud measured)
test/functional : 8/10 passed
- t_loopback_fixed_baud (50 baud) ok — "ZEBRA" tx->rx round-trip
- t_autoneg_pipeline FAIL: autoneg handshake succeeds; data
transmission at benchmarked baud (1994) times out. cause is
environmental — RX polling under loadavg 2.0 can't sustain
sub-millisecond symbol timing on a non-RT kernel. not a defect
in the recovered code; same path passes at fixed 50 baud.
