fix(understand): address review findings — importCount metric source and plan typo

- Update importCount metric description to reference batchImportData[file.path].length
  instead of "number of import statements" (contradicted "do NOT extract imports" rule)
- Fix duplicate /index.js → /index.jsx in impl plan Task 5 extension variants

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/plans/2026-03-27-token-reduction-impl.md

@@ -440,7 +440,7 @@ For each file, read its content and extract import paths using language-appropri
 For each extracted import path:
 1. Compute the resolved file path relative to project root:
    - For relative imports (`./x`, `../x`): resolve from the importing file's directory
-   - Try these extension variants in order if the import has no extension: `.ts`, `.tsx`, `.js`, `.jsx`, `/index.ts`, `/index.js`, `/index.tsx`, `/index.js`, `.py`, `.go`, `.rs`, `.rb`
+   - Try these extension variants in order if the import has no extension: `.ts`, `.tsx`, `.js`, `.jsx`, `/index.ts`, `/index.js`, `/index.tsx`, `/index.jsx`, `.py`, `.go`, `.rs`, `.rb`
 2. Check if the resolved path exists in the discovered file list
 3. If yes: add to this file's resolved imports list
 4. If no: skip (external, unresolvable, or dynamic import)

understand-anything-plugin/skills/understand/file-analyzer-prompt.md

@@ -59,7 +59,7 @@ For each file in `batchFiles`, read the file content and extract:
 **Basic Metrics:**
 - Total line count
 - Non-empty line count (lines that are not blank or comment-only)
-- Import count (number of import statements)
+- Import count — use `batchImportData[file.path].length` from the input JSON (do not count from source)
 - Export count (number of export statements)
 - Function count, class count