v0.5.4 — crash fix

Fixes a cross-platform crash reported by a user (thanks, Anant!): typing /file with no argument — or pointing it at a directory, a binary, or a huge file — killed the entire CLI on Windows and Linux.

• /file now validates its argument and prints a friendly message for every bad input (missing arg, directory, unreadable/binary file, >2MB).
• Structural hardening: all slash commands now run inside exception isolation — a command bug can print an error, but it can never exit your session again.

Upgrade: pipx upgrade meshapi-code — or just press y when the CLI offers it.

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