feat: scaffold remove command foundations

tests/fixtures/remove-samples/README.md

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+# Remove Command Fixtures
+
+Sample directory structures used by remove command tests. Keep filenames ASCII and small.
+
+- `basic/` — General-purpose samples demonstrating sequential token removals.
+- `conflicts/` — Files that collide after token removal to exercise conflict handling.
+- `empties/` — Names that collapse to empty or near-empty results to validate warnings.
+
+Add directories/files sparingly so tests stay fast and portable.