release: promote 0.12.0-dev to main (flext-cli)

[marlon-costa-dc]

ULW promote after flext closeout.

Beads: mro-0zzy

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Summary by cubic

Update .gitignore to ignore generated docs report artifacts under docs/. This prevents committing temporary report .md/.json files for generate, fix, and audit.

^{Written for commit c2a29dd. Summary will update on new commits.}

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