fix: add --yes flag to bypass confirmation in /skills install and uninstall (#1647)

Fixes hanging when using /skills install or /skills uninstall from the
TUI — bare input() calls hang inside prompt_toolkit's event loop.

Changes:
- Add skip_confirm parameter to do_install() and do_uninstall()
- Separate --yes/-y (confirmation bypass) from --force (scan override)
  in both argparse and slash command handlers
- Update usage hint for /skills uninstall to show [--yes]

The original PR (#1595) accidentally deleted the install_from_quarantine()
call, which would have broken all installs. That bug is not present here.

Based on PR #1595 by 333Alden333.

Co-authored-by: 333Alden333 <333Alden333@users.noreply.github.com>

tests/hermes_cli/test_skills_install_flags.py

@@ -1,8 +1,18 @@
+"""
+Tests for --yes / --force flag separation in `hermes skills install`.
+
+--yes / -y  → skip_confirm (bypass interactive prompt, needed in TUI mode)
+--force     → force (install despite blocked scan verdict)
+
+Based on PR #1595 by 333Alden333 (salvaged).
+"""
+
 import sys
 from types import SimpleNamespace
 
 
-def test_cli_skills_install_accepts_yes_alias(monkeypatch):
+def test_cli_skills_install_yes_sets_skip_confirm(monkeypatch):
+    """--yes should set skip_confirm=True but NOT force."""
     from hermes_cli.main import main
 
     captured = {}
@@ -10,6 +20,7 @@ def test_cli_skills_install_accepts_yes_alias(monkeypatch):
     def fake_skills_command(args):
         captured["identifier"] = args.identifier
         captured["force"] = args.force
+        captured["yes"] = args.yes
 
     monkeypatch.setattr("hermes_cli.skills_hub.skills_command", fake_skills_command)
     monkeypatch.setattr(
@@ -20,7 +31,98 @@ def test_cli_skills_install_accepts_yes_alias(monkeypatch):
 
     main()
 
-    assert captured == {
-        "identifier": "official/email/agentmail",
-        "force": True,
-    }
+    assert captured["identifier"] == "official/email/agentmail"
+    assert captured["yes"] is True
+    assert captured["force"] is False
+
+
+def test_cli_skills_install_y_alias(monkeypatch):
+    """-y should behave the same as --yes."""
+    from hermes_cli.main import main
+
+    captured = {}
+
+    def fake_skills_command(args):
+        captured["yes"] = args.yes
+        captured["force"] = args.force
+
+    monkeypatch.setattr("hermes_cli.skills_hub.skills_command", fake_skills_command)
+    monkeypatch.setattr(
+        sys,
+        "argv",
+        ["hermes", "skills", "install", "test/skill", "-y"],
+    )
+
+    main()
+
+    assert captured["yes"] is True
+    assert captured["force"] is False
+
+
+def test_cli_skills_install_force_sets_force(monkeypatch):
+    """--force should set force=True but NOT yes."""
+    from hermes_cli.main import main
+
+    captured = {}
+
+    def fake_skills_command(args):
+        captured["force"] = args.force
+        captured["yes"] = args.yes
+
+    monkeypatch.setattr("hermes_cli.skills_hub.skills_command", fake_skills_command)
+    monkeypatch.setattr(
+        sys,
+        "argv",
+        ["hermes", "skills", "install", "test/skill", "--force"],
+    )
+
+    main()
+
+    assert captured["force"] is True
+    assert captured["yes"] is False
+
+
+def test_cli_skills_install_force_and_yes_together(monkeypatch):
+    """--force --yes should set both flags."""
+    from hermes_cli.main import main
+
+    captured = {}
+
+    def fake_skills_command(args):
+        captured["force"] = args.force
+        captured["yes"] = args.yes
+
+    monkeypatch.setattr("hermes_cli.skills_hub.skills_command", fake_skills_command)
+    monkeypatch.setattr(
+        sys,
+        "argv",
+        ["hermes", "skills", "install", "test/skill", "--force", "--yes"],
+    )
+
+    main()
+
+    assert captured["force"] is True
+    assert captured["yes"] is True
+
+
+def test_cli_skills_install_no_flags(monkeypatch):
+    """Without flags, both force and yes should be False."""
+    from hermes_cli.main import main
+
+    captured = {}
+
+    def fake_skills_command(args):
+        captured["force"] = args.force
+        captured["yes"] = args.yes
+
+    monkeypatch.setattr("hermes_cli.skills_hub.skills_command", fake_skills_command)
+    monkeypatch.setattr(
+        sys,
+        "argv",
+        ["hermes", "skills", "install", "test/skill"],
+    )
+
+    main()
+
+    assert captured["force"] is False
+    assert captured["yes"] is False