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Closes the last #160 gap: claws can now manage session lifecycle entirely through the CLI without filesystem hacks. New commands: - claw list-sessions [--directory DIR] [--output-format text|json] Enumerates stored session IDs. JSON mode emits {sessions, count}. Missing/empty directories return empty list (exit 0), not an error. - claw delete-session SESSION_ID [--directory DIR] [--output-format text|json] Idempotent: not-found is exit 0 with status='not_found' (no raise). Partial-failure: exit 1 with typed JSON error envelope: {session_id, deleted: false, error: {kind, message, retryable}} The 'session_delete_failed' kind is retryable=true so orchestrators know to retry vs escalate. Public API surface extended in src/__init__.py: - list_sessions, session_exists, delete_session - SessionNotFoundError, SessionDeleteError Tests added (tests/test_porting_workspace.py): - test_list_sessions_cli_runs: text + json modes against tempdir - test_delete_session_cli_idempotent: first call deleted=true, second call deleted=false (exit 0, status=not_found) - test_delete_session_cli_partial_failure_exit_1: permission error surfaces as exit 1 + typed JSON error with retryable=true All 43 tests pass. The session storage abstraction chapter is closed: - storage layer decoupled from claw code (#160 initial impl) - delete contract hardened + caller-audited (#160 hardening pass) - CLI wired with idempotency preserved at exit-code boundary (this commit)