fix(mcb): stabilize from clean origin/main with conflict marker CI check

[marlon-costa-dc]

Stabiliza mcb a partir de origin/main clean. Broken merge PR #202 already reverted by c86edc2. CI: 8 workflows.

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Summary by cubic

Adds a CI workflow that fails pull requests targeting main when merge conflict markers are found in tracked files.

• Excludes .venv/, target/, dist/, .cache/, and _vendor/ directories from the check.

^{Written for commit 702bfc7. Summary will update on new commits.}

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