fix(cli): add inline --yes/now skip for destructive slash commands (#30768)

Issue #30768 reports that on native Windows PowerShell the destructive-slash
confirmation modal renders but never registers keypresses, leaving the user
unable to confirm or cancel /reset, /new, /clear, or /undo. The modal works
on macOS, Linux, and WSL; PR #23907 (merged May 11) replaced the
daemon-thread input() pattern with a prompt_toolkit-native keybinding modal
but the win32 input pipeline apparently doesn't dispatch keys to the
filter-conditioned handlers. The modal investigation is ongoing.

This change ships the immediate escape hatch: append `now`, `--yes`, or `-y`
to any destructive slash command to bypass the modal and run the action
immediately. Works on every platform without touching the broken Windows
code path.

  /reset now            -> reset, no modal
  /new --yes my-session -> new session titled "my-session", no modal
  /clear -y             -> clear, no modal
  /undo -y              -> undo, no modal

The default behavior (modal prompts when approvals.destructive_slash_confirm
is True) is unchanged for users who don't pass a skip token.

Implementation:

- New classmethod HermesCLI._split_destructive_skip(text) -> (remainder, skip)
  parses a destructive-slash command string, strips the leading "/cmd" word
  and any recognized skip tokens (case-insensitive exact match, not substring),
  and reports whether a skip was requested.
- HermesCLI._confirm_destructive_slash gains an optional cmd_original= arg.
  When the arg contains a skip token, it returns "once" immediately —
  before the gate check and before any modal rendering.
- The /clear, /new, /undo handlers in process_command pass cmd_original
  through. /new additionally uses _split_destructive_skip to strip skip
  tokens from the remaining text before deriving the session title, so
  "/new now My Session" yields title="My Session" (not "now My Session").

Tests:

- 7 new unit tests in tests/cli/test_destructive_slash_confirm.py covering
  the helper (recognized tokens, command-word stripping, case-insensitive
  exact match, None/empty input) and the modal bypass (now and --yes both
  skip; no-skip-token still consults the modal).
- 3 new integration tests in tests/cli/test_destructive_slash_inline_skip_e2e.py
  driving HermesCLI.process_command end-to-end and asserting (a) new_session
  is invoked, (b) the modal is never reached, (c) the skip token does not
  leak into the session title, and (d) the no-skip-token path still reaches
  the modal as a sanity check that we haven't accidentally short-circuited
  the normal flow.

All 31 tests across the destructive-slash test surface pass.

Docs:

- website/docs/reference/slash-commands.md documents the new flags both in
  the destructive-commands table and the dedicated approval section, with a
  link back to issue #30768 explaining why the escape hatch exists.

tests/cli/test_destructive_slash_inline_skip_e2e.py

@@ -0,0 +1,129 @@
+"""End-to-end integration test for the destructive-slash inline-skip path.
+
+Drives ``HermesCLI.process_command("/reset now")`` against a minimal stand-in
+and verifies:
+
+1. ``new_session`` was invoked (the command actually ran)
+2. ``_prompt_text_input_modal`` was NOT invoked (modal bypassed)
+3. The skip token did not leak into the session title
+
+This is the regression test for issue #30768 — the inline-skip escape hatch
+must work without ever touching the modal, on every platform.
+"""
+
+from __future__ import annotations
+
+from types import SimpleNamespace
+from unittest.mock import patch
+
+
+def _make_cli_stub():
+    """Build a minimal HermesCLI-shaped object that can run ``process_command``
+    for the destructive-slash branches without spinning up a real TUI."""
+    from cli import HermesCLI
+
+    new_session_calls = []
+
+    def _capture_new_session(self_, title=None, silent=False):
+        new_session_calls.append({"title": title, "silent": silent})
+
+    self_ = SimpleNamespace(
+        _app=None,
+        _prompt_text_input_modal=lambda **_kw: (_ for _ in ()).throw(
+            AssertionError("modal must not be invoked when inline-skip token present")
+        ),
+        new_session=lambda **kw: _capture_new_session(self_, **kw),
+        # Stub out side-effects the destructive-slash branches reach for.
+        console=SimpleNamespace(clear=lambda: None),
+        compact=False,
+        model="stub-model",
+        session_id="stub-session",
+        enabled_toolsets=[],
+        _pending_title=None,
+        _session_db=None,
+    )
+    # Bind the methods we need under test.
+    self_._split_destructive_skip = HermesCLI._split_destructive_skip
+    self_._confirm_destructive_slash = HermesCLI._confirm_destructive_slash.__get__(
+        self_, type(self_)
+    )
+    self_.process_command = HermesCLI.process_command.__get__(self_, type(self_))
+    return self_, new_session_calls
+
+
+def test_reset_now_invokes_new_session_without_modal():
+    """``/reset now`` runs ``new_session`` and never touches the modal."""
+    self_, calls = _make_cli_stub()
+
+    with patch(
+        "cli.load_cli_config",
+        return_value={"approvals": {"destructive_slash_confirm": True}},
+    ):
+        self_.process_command("/reset now")
+
+    assert calls, "new_session was never invoked"
+    # The /new branch passes title=None when there's no non-skip remainder.
+    assert calls[0]["title"] is None
+
+
+def test_new_yes_with_title_preserves_title():
+    """``/new --yes My Session`` runs ``new_session(title='My Session')``."""
+    self_, calls = _make_cli_stub()
+
+    with patch(
+        "cli.load_cli_config",
+        return_value={"approvals": {"destructive_slash_confirm": True}},
+    ):
+        self_.process_command("/new --yes My Session")
+
+    assert calls, "new_session was never invoked"
+    assert calls[0]["title"] == "My Session"
+
+
+def test_new_without_skip_token_still_consults_modal():
+    """``/new My Session`` (no skip token) must reach the modal.
+
+    Sanity check that we haven't accidentally short-circuited the normal path.
+    """
+    from cli import HermesCLI
+
+    new_session_calls = []
+    modal_calls = []
+
+    def _capture_new_session(self_, title=None, silent=False):
+        new_session_calls.append({"title": title, "silent": silent})
+
+    def _record_modal(**kw):
+        modal_calls.append(kw)
+        # Simulate user cancelling so new_session is not called.
+        return "3"
+
+    self_ = SimpleNamespace(
+        _app=None,
+        _prompt_text_input_modal=_record_modal,
+        new_session=lambda **kw: _capture_new_session(self_, **kw),
+        console=SimpleNamespace(clear=lambda: None),
+        compact=False,
+        model="stub-model",
+        session_id="stub-session",
+        enabled_toolsets=[],
+        _pending_title=None,
+        _session_db=None,
+    )
+    self_._split_destructive_skip = HermesCLI._split_destructive_skip
+    self_._normalize_slash_confirm_choice = HermesCLI._normalize_slash_confirm_choice.__get__(
+        self_, type(self_)
+    )
+    self_._confirm_destructive_slash = HermesCLI._confirm_destructive_slash.__get__(
+        self_, type(self_)
+    )
+    self_.process_command = HermesCLI.process_command.__get__(self_, type(self_))
+
+    with patch(
+        "cli.load_cli_config",
+        return_value={"approvals": {"destructive_slash_confirm": True}},
+    ):
+        self_.process_command("/new My Session")
+
+    assert modal_calls, "modal must be reached when no skip token is present"
+    assert not new_session_calls, "user cancelled — new_session must not run"