docs: Update test counts to 149 tests across 26 suites

- Added test count to README.md Tests section

- Added test count to AGENTS.md Testing section

Author: avoidwork

AGENTS.md

@@ -68,6 +68,7 @@ Source code is in `src/`.
 ## Testing
 
 - Framework: Node.js built-in test runner (`node --test`)
+- Tests: 149 tests across 26 suites
 - Coverage: 100% lines, 99.28% branches, 100% functions
 - Test pattern: `tests/**/*.js`
 - All tests must pass with 100% line coverage before merging

README.md

@@ -415,6 +415,13 @@ Build produces multiple module formats:
 - `dist/tiny-lru.min.js` - Minified ESM
 - `types/lru.d.ts` - TypeScript definitions
 
+## Tests
+
+| Metric    | Count |
+| --------- | ----- |
+| Tests     | 149   |
+| Suites    | 26    |
+
 ## Test Coverage
 
 | Metric    | Coverage |