feat: add portable fp review skill installer

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2026-06-27 1ce0fd70b0d398b5a226a70f10fd5fc065a620fd

1
{"import_batch_id": "DL_LEGACY_CASE_IMPORT_20260624_V1", "source_name": "legacy_external_information_casebook", "source_kind": "markdown_casebook", "source_document_path": "legacy_source/external_information_casebook.md", "source_hash": "4e8b112c13e5a8fecac8bc8afb4962010955b4242eec6c76ea70d57fe0396892", "case_count": 134, "data_dir": "data/legacy_case_import_20260624", "imported_at": "2026-06-24 07:25:12", "note": "Legacy casebook imported as historical review data for standalone darkline."}