feat: implement remove command with sequential removals

testdata/remove/basic/README.md

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+# Remove Command Scenario Fixtures
+
+Use this directory to capture realistic file layouts for the `renamer remove` tests.
+
+## Layout
+
+```
+testdata/remove/basic
+├── project copy draft.txt
+├── Project copy.txt
+├── nested
+│   ├── foo draft.txt
+│   ├── foo draft draft.txt
+│   └── hidden
+│       └── .draft copy.md
+├── collisions
+│   ├── alpha draft.txt
+│   └── alpha.txt
+└── empty-basename
+    ├── draft
+    └── draft.txt
+```
+
+## Scenarios Covered
+
+- Sequential removals (`" copy"`, `" draft"`) collapsing multiple terms.
+- Duplicate token handling in nested directories.
+- Hidden file interactions requiring the `--hidden` flag.
+- Name collisions after removal (should report conflict prior to apply).
+- Entries that would become empty names, verifying they are skipped with warnings.
+
+Adjust or extend files as additional edge cases are added to integration tests.