diff --git a/baseline/experiments/mnist_mlp3_tangent_rg/README.md b/baseline/experiments/mnist_mlp3_tangent_rg/README.md
index df2521e..545b306 100644
--- a/baseline/experiments/mnist_mlp3_tangent_rg/README.md
+++ b/baseline/experiments/mnist_mlp3_tangent_rg/README.md
@@ -981,3 +981,29 @@ The principal outputs under
   `quotient_flow.log`: live progress/ETA and full terminal-equivalent logs;
 - `report/index.html`: shareable documentation, separate MuonClip-RMS and AdamW
   plots, tables, method coverage, and saved-data links.
+
+
+## Detached command-line lifecycle manager
+
+Use the lifecycle manager instead of pasting shell strict-mode settings or attaching
+`tail -f` to the analysis.  The manager launches the complete four-stage analysis
+in a new OS session, redirects standard output and standard error to
+`/private/tmp`, and returns the terminal prompt immediately.
+
+```bash
+bash baseline/experiments/mnist_mlp3_tangent_rg/scripts/manage_short100_complete_rg_analysis.sh start
+```
+
+The remaining commands are one-shot operations; none attaches a foreground job:
+
+```bash
+bash baseline/experiments/mnist_mlp3_tangent_rg/scripts/manage_short100_complete_rg_analysis.sh status
+bash baseline/experiments/mnist_mlp3_tangent_rg/scripts/manage_short100_complete_rg_analysis.sh log
+bash baseline/experiments/mnist_mlp3_tangent_rg/scripts/manage_short100_complete_rg_analysis.sh stop
+bash baseline/experiments/mnist_mlp3_tangent_rg/scripts/manage_short100_complete_rg_analysis.sh open
+```
+
+`stop` signals only the detached analysis session.  It also recognizes the
+previous `nohup` launcher and terminates only its recorded process tree, never
+the interactive shell or its process group.  Completed checkpoint units are
+resumable by the next `start`.
diff --git a/baseline/experiments/mnist_mlp3_tangent_rg/scripts/manage_short100_complete_rg_analysis.sh b/baseline/experiments/mnist_mlp3_tangent_rg/scripts/manage_short100_complete_rg_analysis.sh
new file mode 100644
index 0000000..58bfee8
--- /dev/null
+++ b/baseline/experiments/mnist_mlp3_tangent_rg/scripts/manage_short100_complete_rg_analysis.sh
@@ -0,0 +1,299 @@
+#!/usr/bin/env bash
+# Detached lifecycle manager for the complete short-100 RG analysis.
+#
+# This file intentionally avoids `set -e` because callers commonly invoke it
+# from an interactive terminal.  Every failure is handled inside this process;
+# no shell options are changed in the caller.
+
+set -u
+
+COMMAND="${1:-start}"
+SCRIPT_DIR="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"
+DEFAULT_REPO="$(CDPATH= cd -- "$SCRIPT_DIR/../../../.." && pwd)"
+
+REPO="${REPO:-$DEFAULT_REPO}"
+RUNS="${RUNS:-/private/tmp/rg-mnist-mlp3-short100-runs}"
+CACHE="${CACHE:-/private/tmp/rg-mnist-mlp3-short100-checkpoints}"
+OUT="${OUT:-/private/tmp/rg-mnist-mlp3-short100-jacobians-reduced}"
+MPLCONFIGDIR="${MPLCONFIGDIR:-/private/tmp/matplotlib-cache}"
+PYTHON_BIN="${PYTHON_BIN:-python}"
+
+WORKER="$REPO/baseline/experiments/mnist_mlp3_tangent_rg/scripts/run_short100_complete_rg_analysis.sh"
+LOG="$OUT/complete_rg_analysis.log"
+PID_FILE="$OUT/run.pid"
+LAUNCH_FILE="$OUT/launch.json"
+
+export REPO RUNS CACHE OUT MPLCONFIGDIR
+export RG_MNIST_TANGENT_ROOT="$RUNS"
+export RG_MNIST_TANGENT_CHECKPOINT_CACHE_ROOT="$CACHE"
+export RG_MNIST_REDUCED_JACOBIAN_OUTPUT_ROOT="$OUT"
+export PYTHONUNBUFFERED=1
+
+usage() {
+    printf '%s\n' \
+        "Usage: bash $0 {start|status|log|stop|open|help}" \
+        "" \
+        "  start   launch in a new OS session and return immediately" \
+        "  status  print process state, stage JSON, and recent log lines" \
+        "  log     print the most recent log lines and return immediately" \
+        "  stop    send SIGTERM only to the recorded analysis process group" \
+        "  open    open the completed static HTML report" \
+        "" \
+        "Data, logs, PID state, figures, CSVs, and HTML all remain under:" \
+        "  $OUT"
+}
+
+read_pid() {
+    if [ ! -f "$PID_FILE" ]; then
+        return 1
+    fi
+    local value
+    value="$(tr -d '[:space:]' < "$PID_FILE" 2>/dev/null)"
+    case "$value" in
+        ''|*[!0-9]*) return 1 ;;
+        *) printf '%s\n' "$value" ;;
+    esac
+}
+
+pid_is_live() {
+    local pid="$1"
+    kill -0 "$pid" 2>/dev/null
+}
+
+print_json_if_present() {
+    local label="$1"
+    local path="$2"
+    if [ -f "$path" ]; then
+        printf '\n%s\n' "$label"
+        "$PYTHON_BIN" -m json.tool "$path" 2>/dev/null || sed -n '1,120p' "$path"
+    fi
+}
+
+start_analysis() {
+    mkdir -p "$OUT" "$MPLCONFIGDIR" || {
+        printf 'ERROR: cannot create output directories beneath %s\n' "$OUT" >&2
+        return 1
+    }
+    if [ ! -f "$WORKER" ]; then
+        printf 'ERROR: worker script not found: %s\n' "$WORKER" >&2
+        return 1
+    fi
+
+    local old_pid
+    old_pid="$(read_pid 2>/dev/null || true)"
+    if [ -n "$old_pid" ] && pid_is_live "$old_pid"; then
+        printf 'Analysis is already running as PID %s.\n' "$old_pid"
+        printf 'Use `%s status` for a one-shot progress report.\n' "$0"
+        return 0
+    fi
+
+    if [ "${RG_SKIP_ENV_PREFLIGHT:-0}" != "1" ]; then
+        "$PYTHON_BIN" -c 'import torch, weightwatcher, powerlaw' >/dev/null 2>&1 || {
+            printf '%s\n' \
+                "ERROR: the active Python environment lacks torch, weightwatcher, or powerlaw." \
+                "Activate rg-muonclip-run, then run this start command again." >&2
+            return 1
+        }
+    fi
+
+    local launched_pid
+    launched_pid="$("$PYTHON_BIN" - "$REPO" "$WORKER" "$LOG" "$LAUNCH_FILE" <<'PY'
+import json
+import os
+from pathlib import Path
+import subprocess
+import sys
+from datetime import datetime, timezone
+
+repo, worker, log_path, launch_path = sys.argv[1:]
+Path(log_path).parent.mkdir(parents=True, exist_ok=True)
+with open(log_path, "ab", buffering=0) as log_handle:
+    process = subprocess.Popen(
+        ["bash", worker],
+        cwd=repo,
+        env=os.environ.copy(),
+        stdin=subprocess.DEVNULL,
+        stdout=log_handle,
+        stderr=subprocess.STDOUT,
+        start_new_session=True,
+        close_fds=True,
+    )
+payload = {
+    "pid": process.pid,
+    "session_id": process.pid,
+    "started_at_utc": datetime.now(timezone.utc).isoformat(),
+    "repository": repo,
+    "worker": worker,
+    "log": log_path,
+    "output_root": os.environ["OUT"],
+}
+temporary = Path(launch_path + ".tmp")
+temporary.write_text(json.dumps(payload, indent=2, sort_keys=True) + "\n")
+temporary.replace(launch_path)
+print(process.pid)
+PY
+)" || {
+        printf 'ERROR: failed to launch the detached analysis.\n' >&2
+        return 1
+    }
+
+    printf '%s\n' "$launched_pid" > "$PID_FILE"
+    printf '%s\n' \
+        "Analysis started in a detached OS session." \
+        "PID: $launched_pid" \
+        "Log: $LOG" \
+        "Output: $OUT" \
+        "Your prompt is now safe to use. Do not press Ctrl-Z; no foreground job is attached." \
+        "Run this for a one-shot update:" \
+        "  bash $0 status"
+}
+
+show_status() {
+    local pid
+    pid="$(read_pid 2>/dev/null || true)"
+    if [ -n "$pid" ] && pid_is_live "$pid"; then
+        printf 'PROCESS: RUNNING\n'
+        ps -p "$pid" -o pid,ppid,%cpu,%mem,etime,state,command 2>/dev/null || \
+            printf 'PID %s is live; detailed process statistics are unavailable.\n' "$pid"
+    elif [ -n "$pid" ]; then
+        printf 'PROCESS: NOT RUNNING (recorded PID %s)\n' "$pid"
+    else
+        printf 'PROCESS: NOT STARTED (no valid PID file)\n'
+    fi
+    print_json_if_present "STAGE 1 STATUS" "$OUT/status.json"
+    print_json_if_present "STAGES 2-3 STATUS" "$OUT/quotient_flow_status.json"
+    if [ -f "$OUT/report/index.html" ]; then
+        printf '\nREPORT: %s\n' "$OUT/report/index.html"
+    fi
+    printf '\nLATEST LOG LINES\n'
+    if [ -f "$LOG" ]; then
+        tail -n "${LOG_LINES:-40}" "$LOG"
+    else
+        printf 'No log exists yet: %s\n' "$LOG"
+    fi
+}
+
+show_log() {
+    if [ ! -f "$LOG" ]; then
+        printf 'No log exists yet: %s\n' "$LOG" >&2
+        return 1
+    fi
+    tail -n "${LOG_LINES:-100}" "$LOG"
+}
+
+stop_analysis() {
+    local pid
+    pid="$(read_pid 2>/dev/null || true)"
+    if [ -z "$pid" ]; then
+        printf 'No valid analysis PID is recorded in %s\n' "$PID_FILE"
+        return 0
+    fi
+    if ! pid_is_live "$pid"; then
+        printf 'Analysis PID %s is already stopped.\n' "$pid"
+        return 0
+    fi
+    "$PYTHON_BIN" - "$pid" "$LAUNCH_FILE" "$WORKER" <<'PY'
+import json
+import os
+from pathlib import Path
+import signal
+import subprocess
+import sys
+
+pid = int(sys.argv[1])
+launch_path = Path(sys.argv[2])
+expected_worker = str(Path(sys.argv[3]).resolve())
+managed = False
+if launch_path.is_file():
+    launch = json.loads(launch_path.read_text())
+    managed = (
+        int(launch.get("pid", -1)) == pid
+        and str(Path(launch.get("worker", "")).resolve()) == expected_worker
+    )
+
+if managed:
+    try:
+        session_id = os.getsid(pid)
+    except ProcessLookupError:
+        raise SystemExit(f"Analysis PID {pid} is already stopped")
+    if session_id != pid:
+        raise SystemExit(
+            f"Refusing to signal PID {pid}: it is not the detached session leader"
+        )
+    os.killpg(pid, signal.SIGTERM)
+else:
+    # Compatibility path for the old nohup launcher.  Signal only the recorded
+    # job and its descendants--never its process group, which may contain the
+    # interactive shell.  Refuse unless the process tree contains a known RG
+    # analysis command.
+    listing = subprocess.run(
+        ["ps", "-axo", "pid=,ppid=,command="],
+        check=True,
+        capture_output=True,
+        text=True,
+    ).stdout
+    processes = {}
+    children = {}
+    for line in listing.splitlines():
+        fields = line.strip().split(None, 2)
+        if len(fields) < 2:
+            continue
+        observed_pid, parent_pid = map(int, fields[:2])
+        command = fields[2] if len(fields) == 3 else ""
+        processes[observed_pid] = command
+        children.setdefault(parent_pid, []).append(observed_pid)
+    if pid not in processes:
+        raise SystemExit(f"Analysis PID {pid} is already stopped")
+    descendants = []
+    stack = list(children.get(pid, ()))
+    while stack:
+        child = stack.pop()
+        descendants.append(child)
+        stack.extend(children.get(child, ()))
+    known = (
+        "run_short100_complete_rg_analysis.sh",
+        "run_short100_jacobians_cli.py",
+        "run_short100_quotient_flow_cli.py",
+        "build_short100_jacobian_report.py",
+    )
+    tree = [pid, *descendants]
+    if not any(any(name in processes.get(item, "") for name in known) for item in tree):
+        raise SystemExit(
+            f"Refusing to signal PID {pid}: its process tree is not the RG analysis"
+        )
+    for item in [*reversed(descendants), pid]:
+        try:
+            os.kill(item, signal.SIGTERM)
+        except ProcessLookupError:
+            pass
+PY
+    if [ "$?" -ne 0 ]; then
+        return 1
+    fi
+    printf 'Sent SIGTERM to detached analysis process group %s.\n' "$pid"
+    printf 'Completed checkpoint units remain on disk and the next start resumes them.\n'
+}
+
+open_report() {
+    local report="$OUT/report/index.html"
+    if [ ! -f "$report" ]; then
+        printf 'Report is not ready: %s\n' "$report" >&2
+        printf 'Use `%s status` to inspect the current stage.\n' "$0" >&2
+        return 1
+    fi
+    /usr/bin/open "$report"
+}
+
+case "$COMMAND" in
+    start) start_analysis ;;
+    status) show_status ;;
+    log) show_log ;;
+    stop) stop_analysis ;;
+    open) open_report ;;
+    help|-h|--help) usage ;;
+    *)
+        printf 'Unknown command: %s\n\n' "$COMMAND" >&2
+        usage >&2
+        exit 2
+        ;;
+esac
diff --git a/baseline/tests/tangent_rg/test_detached_analysis_manager.py b/baseline/tests/tangent_rg/test_detached_analysis_manager.py
new file mode 100644
index 0000000..0bd9665
--- /dev/null
+++ b/baseline/tests/tangent_rg/test_detached_analysis_manager.py
@@ -0,0 +1,43 @@
+from pathlib import Path
+
+
+REPOSITORY_ROOT = Path(__file__).resolve().parents[2]
+MANAGER = (
+    REPOSITORY_ROOT
+    / "experiments"
+    / "mnist_mlp3_tangent_rg"
+    / "scripts"
+    / "manage_short100_complete_rg_analysis.sh"
+)
+
+
+def test_manager_never_changes_the_callers_errexit_or_attaches_a_log_tail():
+    source = MANAGER.read_text(encoding="utf-8")
+    executable_lines = [
+        line.strip() for line in source.splitlines()
+        if line.strip() and not line.lstrip().startswith("#")
+    ]
+
+    assert not any(line.startswith("set -e") for line in executable_lines)
+    assert "tail -f" not in source
+    assert "tail -F" not in source
+
+
+def test_manager_launches_a_new_session_and_exposes_safe_lifecycle_commands():
+    source = MANAGER.read_text(encoding="utf-8")
+
+    assert "start_new_session=True" in source
+    assert "stdin=subprocess.DEVNULL" in source
+    assert "stdout=log_handle" in source
+    assert "stderr=subprocess.STDOUT" in source
+    for command in ("start", "status", "log", "stop", "open"):
+        assert f"{command})" in source
+
+
+def test_legacy_stop_never_signals_the_interactive_process_group():
+    source = MANAGER.read_text(encoding="utf-8")
+
+    assert "old nohup launcher" in source
+    assert "os.kill(item, signal.SIGTERM)" in source
+    assert "os.killpg(pid, signal.SIGTERM)" in source
+    assert "if managed:" in source