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>

core/logging/logger.ts

@@ -1,7 +1,39 @@
-import pino from "pino";
+import type { Bindings, LevelWithSilentOrString, LogFn } from "pino";
 
 /**
- * Silent logger for use when no logger is injected. Satisfies pino.Logger,
- * does not output anything. InspectorClient uses this as the default.
+ * Logging surface InspectorClient uses. Real pino loggers satisfy this;
+ * the default silent logger implements it without opening a stream.
  */
-export const silentLogger = pino({ level: "silent" });
+export interface InspectorLogger {
+  level: LevelWithSilentOrString;
+  fatal: LogFn;
+  error: LogFn;
+  warn: LogFn;
+  info: LogFn;
+  debug: LogFn;
+  trace: LogFn;
+  silent: LogFn;
+  child(bindings?: Bindings): InspectorLogger;
+}
+
+const noop: LogFn = () => {};
+
+function createSilentLogger(): InspectorLogger {
+  const logger: InspectorLogger = {
+    level: "silent",
+    fatal: noop,
+    error: noop,
+    warn: noop,
+    info: noop,
+    debug: noop,
+    trace: noop,
+    silent: noop,
+    child: () => logger,
+  };
+  return logger;
+}
+
+/**
+ * Default logger when none is injected. No-op at all levels; no SonicBoom stream.
+ */
+export const silentLogger: InspectorLogger = createSilentLogger();