reconstruct and build @anthropic-ai/claude-code source from source map

- Extract 4756 source files from cli.js.map (57MB)
- Set up Bun build system with bun:bundle feature flag shim
- Configure 90+ compile-time feature flags matching production defaults
- Inject MACRO constants (VERSION, BUILD_TIME, etc.)
- Create stubs for private packages (color-diff-napi, modifiers-napi, etc.)
- Install all public dependencies via pnpm
- Patch commander v14 to allow multi-char short flags (-d2e)
- Build output: dist/cli.js (22MB), verified working

claude-code-source/node_modules/@smithy/util-body-length-node/dist-cjs/index.js

@@ -0,0 +1,32 @@
+'use strict';
+
+var node_fs = require('node:fs');
+
+const calculateBodyLength = (body) => {
+    if (!body) {
+        return 0;
+    }
+    if (typeof body === "string") {
+        return Buffer.byteLength(body);
+    }
+    else if (typeof body.byteLength === "number") {
+        return body.byteLength;
+    }
+    else if (typeof body.size === "number") {
+        return body.size;
+    }
+    else if (typeof body.start === "number" && typeof body.end === "number") {
+        return body.end + 1 - body.start;
+    }
+    else if (body instanceof node_fs.ReadStream) {
+        if (body.path != null) {
+            return node_fs.lstatSync(body.path).size;
+        }
+        else if (typeof body.fd === "number") {
+            return node_fs.fstatSync(body.fd).size;
+        }
+    }
+    throw new Error(`Body Length computation failed for ${body}`);
+};
+
+exports.calculateBodyLength = calculateBodyLength;