feat: implement remove command with sequential removals

AGENTS.md

@@ -20,6 +20,7 @@ tests/
 
 - `renamer list` — preview rename scope with shared flags before executing changes.
 - `renamer replace` — consolidate multiple literal patterns into a single replacement (supports `--dry-run` + `--yes`).
+- `renamer remove` — delete ordered substrings from filenames with empty-name protections, duplicate warnings, and undoable ledger entries.
 - `renamer undo` — revert the most recent rename/replace batch using ledger entries.
 - Persistent scope flags: `--path`, `-r/--recursive`, `-d/--include-dirs`, `--hidden`, `--extensions`, `--yes`, `--dry-run`.
 
@@ -32,12 +33,12 @@ tests/
 ## Testing
 
 - `go test ./...`
-- Contract tests: `tests/contract/replace_command_test.go`
-- Integration tests: `tests/integration/replace_flow_test.go`
-- Smoke: `scripts/smoke-test-replace.sh`
+- Contract tests: `tests/contract/replace_command_test.go`, `tests/contract/remove_command_preview_test.go`, `tests/contract/remove_command_ledger_test.go`
+- Integration tests: `tests/integration/replace_flow_test.go`, `tests/integration/remove_flow_test.go`, `tests/integration/remove_undo_test.go`, `tests/integration/remove_validation_test.go`
+- Smoke: `scripts/smoke-test-replace.sh`, `scripts/smoke-test-remove.sh`
 
 ## Recent Changes
-- 003-add-remove-command: Added Go 1.24 + `spf13/cobra`, `spf13/pflag`
+- 003-add-remove-command: Added sequential `renamer remove` subcommand, automation-friendly ledger metadata, and CLI warnings for duplicates/empty results
 - 002-add-replace-command: Added `renamer replace` command, ledger metadata, and automation docs.
 - 001-list-command-filters: Added `renamer list` command with shared scope flags and formatters.