Add issues #16–#23

#16 multiline shell commands
#17 _ scope (global vs local)
#18 path expansion (~)
#19 nested commands trigger prompt2
#20 simplify backtick return value
#21 prompt redesign
#22 implicit interactive commands (drop ! prefix)
#23 general cleanup and refactor

issues/16-multiline-shell-commands.md

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+# 16 — Multiline shell commands
+
+**Status:** open
+
+Can we handle multiline shell commands? For example, commands that span multiple lines with continuations or heredocs. Currently unclear if backtick syntax or `!` prefix handles this at all.
+
+## Questions
+
+- What should the syntax look like for multiline commands?
+- Should `\` at end-of-line continue a command?
+- How does this interact with prompt2?