Update coverage thresholds to 100%

Increases coverage thresholds to reflect achieved 100% coverage:
- Vitest: branches, lines, statements 99.8% → 100%
- Type coverage: atLeast 99% → 100%

All coverage metrics now at 100%: statements, branches, functions, lines, types.

Author: jdalton

.config/vitest.config.mts

@@ -47,10 +47,10 @@ export default defineConfig({
       ],
       all: true,
       thresholds: {
-        branches: 99.8,
+        branches: 100,
         functions: 100,
-        lines: 99.8,
-        statements: 99.8,
+        lines: 100,
+        statements: 100,
       },
       // Coverage should report on src files.
       reportsDirectory: './coverage',

package.json

@@ -132,7 +132,7 @@
   },
   "typeCoverage": {
     "cache": true,
-    "atLeast": 99,
+    "atLeast": 100,
     "ignoreAsAssertion": true,
     "ignoreCatch": true,
     "ignoreEmptyType": true,