STAT-115-remove-check-shared-block: Remove claude/check-shared-block composite action
Superseded by a live @../stat-tackler-claude/CLAUDE.md import, which means there is no per-repo copy left to drift and nothing left to check (part of STAT-115). Claude-Session: https://claude.ai/code/session_01FS9R1ZEc8Vu7hg2PmzqbpP
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