Every write-bearing journal indexer invocation now runs solstone-core indexer; query, count, display, and interactive search stay Python. Delete the core.indexer / core.indexer_on_decline selector, the 69 decline-fallback, and the Python CLI write blocks rather than deprecating them; the command no longer reads either key. Remove reset_journal_index and its export. Write-bearing commands on hosts with no compatible solstone-core wheel, including musl Linux and Intel macOS, exit 78 before native execution, Python writes, or query. Make --rescan-file with --rescan/--rescan-full exit 64 before any side effect, replacing the old partial-side-effect ordering. Rename native_seam.py to native.py. Teach the indexer differential harness the native edge-extraction-skip stderr wording, mirroring the existing native markdown-sanitize rule, and point the fixture-corpus commands at the retired-selector-free journal indexer invocation.