feat: port CLI, TUI, and launcher from v1.5 into v2 (#1452)

Ports the CLI, TUI, and launcher from v1.5 into v2 behind a single
`mcp-inspector` entrypoint (launcher → web/cli/tui). Includes the
`mcp-inspector --web --dev` launcher fix (Vite alias resolution + prod-server
double-start), the root `postinstall` install cascade with simplified CI, and
spec/AGENTS docs (no-workspaces rationale, Development setup).

Closes #1246.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

clients/tui/src/components/NotificationsTab.tsx

@@ -0,0 +1,83 @@
+import React, { useEffect, useRef } from "react";
+import { Box, Text, useInput, type Key } from "ink";
+import { ScrollView, type ScrollViewRef } from "ink-scroll-view";
+import type { StderrLogEntry } from "@inspector/core/mcp/index.js";
+
+interface NotificationsTabProps {
+  stderrLogs: StderrLogEntry[];
+  width: number;
+  height: number;
+  onCountChange?: (count: number) => void;
+  focused?: boolean;
+}
+
+export function NotificationsTab({
+  stderrLogs,
+  width,
+  height,
+  onCountChange,
+  focused = false,
+}: NotificationsTabProps) {
+  const scrollViewRef = useRef<ScrollViewRef>(null);
+  const onCountChangeRef = useRef(onCountChange);
+
+  // Update ref when callback changes
+  useEffect(() => {
+    onCountChangeRef.current = onCountChange;
+  }, [onCountChange]);
+
+  useEffect(() => {
+    onCountChangeRef.current?.(stderrLogs.length);
+  }, [stderrLogs.length]);
+
+  // Handle keyboard input for scrolling
+  useInput(
+    (input: string, key: Key) => {
+      if (focused) {
+        if (key.upArrow) {
+          scrollViewRef.current?.scrollBy(-1);
+        } else if (key.downArrow) {
+          scrollViewRef.current?.scrollBy(1);
+        } else if (key.pageUp) {
+          const viewportHeight =
+            scrollViewRef.current?.getViewportHeight() || 1;
+          scrollViewRef.current?.scrollBy(-viewportHeight);
+        } else if (key.pageDown) {
+          const viewportHeight =
+            scrollViewRef.current?.getViewportHeight() || 1;
+          scrollViewRef.current?.scrollBy(viewportHeight);
+        }
+      }
+    },
+    { isActive: focused },
+  );
+
+  return (
+    <Box width={width} height={height} flexDirection="column" paddingX={1}>
+      <Box paddingY={1} flexShrink={0}>
+        <Text bold backgroundColor={focused ? "yellow" : undefined}>
+          Logging ({stderrLogs.length})
+        </Text>
+      </Box>
+      {stderrLogs.length === 0 ? (
+        <Box paddingY={1}>
+          <Text dimColor>No stderr output yet</Text>
+        </Box>
+      ) : (
+        <ScrollView ref={scrollViewRef} height={height - 3}>
+          {stderrLogs.map((log, index) => (
+            <Box
+              key={`log-${log.timestamp.getTime()}-${index}`}
+              paddingY={0}
+              flexDirection="row"
+              flexShrink={0}
+            >
+              <Text dimColor>[{log.timestamp.toLocaleTimeString()}] </Text>
+              <Text color="red">{log.message}</Text>
+            </Box>
+          ))}
+        </ScrollView>
+      )}
+    </Box>
+  );
+}