FOLLOW-UP: Add smoke tests after building release binaries

[adnaan]

Context

This follow-up task was identified during the review of PR #122.

Source PR: #122
PR Title: feat: add CLI release workflow and Homebrew support
Suggested by: @claude[bot]

Task Description

Add a simple smoke test step after building binaries to verify they execute correctly before releasing.

Implementation

Add after the build step in .github/workflows/cli-release.yml:

- name: Smoke test
  run: |
    ./tinkerdown version
    ./tinkerdown help

Benefits

• Catches basic runtime issues (missing dependencies, broken builds)
• Provides confidence before release
• Fast to run (seconds)

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This issue was automatically created by prmonitor from PR review comments.