core/tools: review a wrapper option that carries a command line

`env -S "rm -rf /"` ran a command nothing looked at: the option belongs to the
wrapper, so the scan skipped it and the denylist found no program to block while
the soft confirm had no interpreter to review. Collect those values — `env
-S`/`--split-string` and `su -c`/`--command`/`--session-command`, jammed
`--opt=value` and `-Svalue` forms included — and confirm the call the way an
interpreter's `-c` one-liner is confirmed, printing the text under its own
`env -S` label. Recursing into the text for a hard denylist is left out for now:
the review asks the human, who sees the command.

tests/test_tools/test_command_scan.py

@@ -92,6 +92,31 @@ def test_unwrap_value_free_flags_do_not_swallow_the_program() -> None:
         assert scan.command[0] == base, argv
 
 
+def test_unwrap_collects_command_line_option_values() -> None:
+    """A wrapper option that takes a command line is reported, not just skipped.
+
+    ``env -S "rm -rf /"`` hands over a command the review must see; the value is
+    code, so it must not be treated as an argument (or as the program).
+    """
+    scan = unwrap_command(["env", "-S", "rm -rf /"])
+    assert scan.base == "env"
+    assert [(span.wrapper, span.option, span.text) for span in scan.command_strings] == [("env", "-S", "rm -rf /")]
+    assert scan.command_strings[0].label == "env -S"
+
+    for argv, option, text in (
+        (["env", "--split-string=rm -rf /"], "--split-string", "rm -rf /"),
+        (["env", "-Srm -rf /"], "-S", "rm -rf /"),
+        (["su", "-c", "rm -rf /"], "-c", "rm -rf /"),
+        (["su", "--session-command=rm -rf /"], "--session-command", "rm -rf /"),
+    ):
+        spans = unwrap_command(argv).command_strings
+        assert [(span.option, span.text) for span in spans] == [(option, text)], argv
+
+    # Plain wrapper options stay arguments: no command line to review.
+    assert unwrap_command(["env", "-u", "FOO=1", "rm", "-rf", "/"]).command_strings == ()
+    assert unwrap_command(["env", "FOO=1", "git", "-c", "x=y", "log"]).command_strings == ()
+
+
 def test_unwrap_empty_argv() -> None:
     scan = unwrap_command([])
     assert scan.base == ""