fix: correct capability presentation examples

[sungmpar]

Summary

• correct the four capabilities:presentation help examples that used the
  non-existent capabilities:presentations command
• strengthen regression coverage to verify the complete example array
• add a patch changeset for @smartthings/cli

Root cause

The command is registered as capabilities:presentation, but four independently
hard-coded help examples used capabilities:presentations. The existing builder
test only verified that the example builder was called once, so incorrect
example arguments were not detected.

Verification

• npm run build
• npm run test -- --runTestsByPath src/__tests__/commands/capabilities/presentation.test.ts --no-watchman
• npm run lint
• npm run test -- --no-watchman
• git diff --check upstream/main...HEAD
• node dist/src/run.js capabilities:presentation --help

The built help output contains all four corrected singular examples and zero
capabilities:presentations examples. The README generator ran as part of
npm run build and produced no tracked README change.

Fixes #842

Checklist

• I have read the CONTRIBUTING document
• Any required documentation has been added
• My code follows the code style of this project (npm run lint produces no warnings/errors)
• I have added tests to cover my changes

[changeset-bot]

🦋 Changeset detected

Latest commit: 20ce290

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@smartthings/cli	Patch

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