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 fix: eradicate local flext, adopt canonical src layout, owner-first cutover #202 já revertido por c86edc2 no main
• Nenhum conflict marker no main
• CI: 8 workflows (7 existentes + 1 nova: conflict-marker-check)

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Summary by cubic

Adds a conflict-marker-check workflow that fails pull requests to main when merge conflict markers are found in tracked files, preventing broken merges like PR #202 from landing again.

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

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