feat(tty): MiMo harness process-ownership contract — group-killed bash execution + explicit detachment
TTY-repair tranche: bash.ts v2 replaces bare execSync with a
process-group-owned spawn wrapper (MODE A: captured pipes, own pgid,
SIGTERM->SIGKILL group kill on timeout, listener teardown before
finalize) and an explicit detached mode (MODE B: setsid, stdin
/dev/null, output to a durable log file, unref) for nohup/setsid/&-
suffixed commands. Wait-intent compilation preserved with a STRICT
gate (normalized=true + ContinuePendingOperation + concrete operation
bound); arbitrary shell syntax passes through untouched. execFile
with argv array (no nested sh -c quoting) for the router call.
await-operation.ts pinned as canonical source (accepted healthy path,
unchanged). scripts/install_mimo_tools.py installs + hash-verifies.
tests/test_mimo_tty_contract.py: 8 tests (A-I incl. fd-no-pts,
group-kill, no-accumulation, quoting, wait-intent boundary,
await-op preservation).
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