New .local/bin/spam-ascii POSIX shell script: resolves a pattern to
a file in ~/ascii with this order:
1. exact filename match
2. exact name + common ASCII-art extension (.txt/.ans/.asc)
3. first case-insensitive substring match (sorted alphabetically)
Non-zero exit + stderr-ish error if nothing matches, so /spam
prints 'no match in ~/ascii for: <pattern>' instead of spewing
a missing-file error.
Rewire the irssi /spam alias to call the script instead of
hardcoding 'cat ~/ascii/$0'. Now:
/spam mario -> matches ~/ascii/mario.txt or ~/ascii/Mario_art.ans
/spam MARIO -> case-insensitive
/spam nothere -> 'no match in ~/ascii for: nothere'
dissimulo
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