feat(ux): improve interactive mode readability and input visibility

- Replace plain 'tai>' prompt with styled console.input() bold cyan prompt
- Wrap interactive mode entry in a Rich Panel with border
- Frame each AI response with Rule dividers (──── AI Response ────)
- Style guardrail warnings with ⚠ prefix and bold yellow
- Improve /help output with formatted Panel showing all commands
- Style collection report: ✓/✗ per item with color, truncation in dim
- Style probe output: ✓/✗ with green/red, host info in dim
- Add Rule header divider on session start

tests/test_cli.py

@@ -137,8 +137,9 @@ def test_collect_success_prints_summary(monkeypatch) -> None:  # type: ignore[no
 
     assert result.exit_code == 0
     assert "Collection complete" in result.stdout
-    assert "kernel: ok" in result.stdout
-    assert "journal: ok (truncated)" in result.stdout
+    assert "kernel" in result.stdout
+    assert "journal" in result.stdout
+    assert "truncated" in result.stdout
 
 
 def test_interactive_collect_then_quit(monkeypatch) -> None:  # type: ignore[no-untyped-def]
@@ -163,7 +164,7 @@ def test_interactive_collect_then_quit(monkeypatch) -> None:  # type: ignore[no-
     commands = iter(["/collect", "/quit"])
 
     monkeypatch.setattr("tai.cli.collect_from_plan", fake_collect_from_plan)
-    monkeypatch.setattr("builtins.input", lambda _prompt: next(commands))
+    monkeypatch.setattr("tai.cli.console.input", lambda _prompt: next(commands))
 
     runner = CliRunner()
     result = runner.invoke(
@@ -180,7 +181,7 @@ def test_interactive_collect_then_quit(monkeypatch) -> None:  # type: ignore[no-
     )
 
     assert result.exit_code == 0
-    assert "Interactive mode" in result.stdout
+    assert "ask questions directly" in result.stdout.lower()
     assert "Collection complete" in result.stdout
     assert "Bye." in result.stdout
 
@@ -210,7 +211,7 @@ def test_interactive_unknown_command_prints_hint(monkeypatch) -> None:  # type:
         "tai.cli.AIClient.stream",
         lambda *_args, **_kwargs: iter(["Check logs."]),
     )
-    monkeypatch.setattr("builtins.input", lambda _prompt: next(commands))
+    monkeypatch.setattr("tai.cli.console.input", lambda _prompt: next(commands))
 
     runner = CliRunner()
     result = runner.invoke(
@@ -227,5 +228,5 @@ def test_interactive_unknown_command_prints_hint(monkeypatch) -> None:  # type:
     )
 
     assert result.exit_code == 0
-    assert "Analyzing..." in result.stdout
+    assert "AI Response" in result.stdout
     assert "Check logs." in result.stdout