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

[marlon-costa-dc]

ULW promote after main absorb.

Beads: mro-0zzy

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Summary by cubic

Promote 0.12.0-dev to main for flext-core, aligning branch history and preserving CI/workflow hooks from main. No functional code changes; this sets up main for the 0.12.x release line.

^{Written for commit 2a91829. Summary will update on new commits.}

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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