fix(help): include request-timeout in global flag guidance

[JerryNee]

What

--request-timeout is a global flag, but it was missing from two pieces of global-flag guidance:

• the helper that rephrases misplaced global flags after subcommands
• the shared GLOBAL_OPTS_HINT footer appended to subcommand help text

Why

When a user places a known global flag after a subcommand, the CLI tries to turn Commander’s generic unknown option message into an actionable hint. --request-timeout should get the same treatment as --output, --profile, and --endpoint-url.

Changes

• Add request-timeout to the global flag arity table as a value flag.
• Include --request-timeout in the shared global options help footer.
• Add regression tests for the rephrased misplaced-flag message.
• Refresh help snapshots for the updated footer.

Verification

• npx vitest run src/lib/render-error.test.ts test/help.snapshot.test.ts -u
• npm run typecheck
• npm run lint
• npm run format:check
• npm test