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).
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