Document [skip ci] directive behavior to prevent release workflow suppression

[Copilot]

The latest commit on main didn't trigger the release workflow because it contained [skip ci] in the commit message. This GitHub Actions directive suppresses all workflow execution, including release automation.

Changes

• README.md: Added warning in Contributing section that [skip ci], [ci skip], and similar directives prevent release workflows from running. Specified these should only be used on feature branches.

• release.yml: Added inline comments documenting that the workflow won't run when skip directives are present in commit messages.

Context

commit fab7ea5b258f8b6c25c9a19cf82ad0c3736b6273
Message: Update Mcu component output to "hello react-mcu" (#4)
...
[skip ci]    # ← This suppressed the release workflow

The workflow trigger configuration was correct—the issue was improper use of skip directives on main branch commits.

Original prompt

despite .github/workflows/release.yml my latest commit on main didnt triggered a release workflow why?

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