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/.ignored/yaml/dist/compose/util-empty-scalar-position.js

@@ -0,0 +1,28 @@
+'use strict';
+
+function emptyScalarPosition(offset, before, pos) {
+    if (before) {
+        pos ?? (pos = before.length);
+        for (let i = pos - 1; i >= 0; --i) {
+            let st = before[i];
+            switch (st.type) {
+                case 'space':
+                case 'comment':
+                case 'newline':
+                    offset -= st.source.length;
+                    continue;
+            }
+            // Technically, an empty scalar is immediately after the last non-empty
+            // node, but it's more useful to place it after any whitespace.
+            st = before[++i];
+            while (st?.type === 'space') {
+                offset += st.source.length;
+                st = before[++i];
+            }
+            break;
+        }
+    }
+    return offset;
+}
+
+exports.emptyScalarPosition = emptyScalarPosition;