c82f4636f2
Two remaining formatting variants that silently killed file delivery: - A trailing sentence period (MEDIA:/x/data.csv.) failed the boundary lookahead, so the tag neither extracted nor stripped. The period is now accepted as a boundary only when followed by whitespace/EOL, keeping multi-part extensions (.tar.gz) intact. - A whole tag wrapped in inline code (`MEDIA:/x/data.csv`) was masked as a prose example (#35695). Models routinely format paths as inline code, eating real deliveries. Inline-code tags now deliver when the path validates on disk; non-existent example paths stay masked and fenced code blocks remain fully masked. Adds a regression matrix covering both plus the salvaged contributor fixes (emphasis wrap, glued tags, glued [[as_document]], dedupe, unknown-extension and extensionless delivery).