feat(terminology): prose sweep tool and custodian workplan cleanup (CUST-WP-0055 T04)

Add sweep_workstream_prose.py for agent-guidance files, sweep active workplan
prose in-repo, tighten scan allowlist exclusions, and update ADR-001 closure
protocol to workplan-first terminology.

e2e-framework/cli.py

@@ -40,9 +40,9 @@ def main() -> None:
         help="Keep sandbox after run",
     )
     parser.add_argument(
-        "--workstream-id",
+        "--workplan-id",
         default=None,
-        help="State Hub workstream ID for progress event",
+        help="State Hub workplan ID for progress event",
     )
     parser.add_argument(
         "--no-report",