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

[marlon-costa-dc]

ULW promote after flext closeout.

Beads: mro-0zzy

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Summary by cubic

Promotes 0.12.0-dev to main and updates .gitignore to exclude generated docs report artifacts. This keeps docs/ clean by ignoring generate, fix, and audit report markdown and JSON files.

^{Written for commit a707ffa. Summary will update on new commits.}

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[gemini-code-assist]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud