[core] 80-character help formatting + Fix CJK description issues in zsh and fish

[forfudan]

This PR updates ArgMojo’s CLI help generation to use a consistent 80-column two-column layout with wrapping, and adjusts shell completion/help expectations (including changes aimed at better handling of non-ASCII text).

Changes:

• Add shared help-layout constants and new wrapping/formatting helpers in utils.mojo.
• Refactor Command._generate_help() sections (usage/options/commands/args) to use the new two-column formatting and wrap long content.
• Update tests and examples to match the new help formatting and the built-in completions trigger naming/placeholder output.

[Copilot]

Pull request overview

Updates ArgMojo’s CLI help generation to use a consistent 80-column two-column layout with wrapping, and adjusts shell completion/help expectations (including changes aimed at better handling of non-ASCII text).

Changes:

• Add shared help-layout constants and new wrapping/formatting helpers in utils.mojo.
• Refactor Command._generate_help() sections (usage/options/commands/args) to use the new two-column formatting and wrap long content.
• Update tests and examples to match the new help formatting and the built-in completions trigger naming/placeholder output.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/test_options.mojo	Makes deprecated-tag assertions less brittle to formatting/wrapping changes.
tests/test_help.mojo	Updates dynamic-padding test to account for overflow + wrapped descriptions.
tests/test_completion.mojo	Updates completion/help expectations for the built-in completions trigger and placeholder text.
src/argmojo/utils.mojo	Introduces 80-column help layout constants and wrapping/two-column formatting helpers.
src/argmojo/command.mojo	Refactors help generation to the new layout/wrapping; updates completions trigger default; improves Unicode-safe escaping loops.
examples/yu.mojo	Adds explicit newlines in CJK help strings to control wrapping/line breaks.
docs/argmojo_overall_planning.md	Marks 80-character help formatting as completed and adds planning notes.

Comments suppressed due to low confidence (1)

src/argmojo/command.mojo:4907

• In _fish_escape, text.codepoint_slices() yields slices; appending ch directly (result += ch) is inconsistent with _zsh_escape (which uses String(ch)) and may not type-check/compile. Convert ch to String before concatenation (and keep comparisons consistent) to ensure Unicode-safe escaping works.

        for ch in text.codepoint_slices():
            if ch == "'":
                result += "\\'"
            else:
                result += ch

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