docs(skills): add a category-exception protocol to add-tests

The Normal/Boundary/Error rule forced all three categories on every function, including pure adapters, generated code, and framework glue where a category would only re-test the framework. Step 7 now lets you skip a category in those cases, as long as you state and justify the skip in the plan and cover the behavior at integration or E2E level — a stated decision, never a silent omission. Step 12 points back to it.

The companion audit item about a missing typescript-testing.md reference turned out moot: that ruleset now exists and add-tests already references it correctly.

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