generated from coulomb/repo-seed
distribute/base.py: Artifact dataclass + Distributor protocol + idempotent BEGIN/END snippet markers (upsert_block replaces a pattern's block in place so re-distribution doesn't duplicate) + agnostic markdown body rendering from SolutionPattern fields. BaseDistributor honours per-flavor body/target hints. 8 new tests; suite 110/110. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>