Boots the harness, runs every script under replays/, tracks pass/fail,
and tears down on exit. Closes the README's TODO for the harness runner
that the per-replay-registration comment referenced.
Usage:
./run-all-replays.sh # boot, run, teardown
KEEP_UP=1 ./run-all-replays.sh # leave harness running on exit
REBUILD=1 ./run-all-replays.sh # rebuild images before booting
Trap-on-EXIT teardown ensures partial-failure runs don't leak Docker
resources. Returns non-zero if any replay failed; CI can adopt this as
a single command without per-replay registration. Phase 2 picks this up
to wire harness-based E2E as a required check.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
