fix(cli): align terminal output by display width

[hughgrigg]

Terminal tables and help text now measure terminal display width. CJK text, combining marks, and joined emoji align with ASCII columns. The build bundles string-width into the display-width module and keeps packed CLI help self-contained. Tests cover the affected text shapes. pnpm check passes through the coverage step, where 81 Yulin-backed tests fail locally because their simulated S3 buckets and Athena workgroup are unavailable.

• Conventional commit message, used as the title

• Conventional branch name, like feat/concise-description

• Full check with pnpm run check passed

• Rebased off latest main

• User-facing behaviour is documented in docs/

See https://www.conventionalcommits.org/en/v1.0.0/

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📥 Commits

Reviewing files that changed from the base of the PR and between dc52255 and 247e25d.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (6)

• package.json
• src/cli/display-width.ts
• src/cli/output/table.test.ts
• src/cli/output/table.ts
• src/cli/text-layout.test.ts
• src/cli/text-layout.ts

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