chore(release): prepare v2.1.0-alpha.1 checkpoint

CITATION.cff

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+cff-version: 1.2.0
+message: "If you use OpenUltraSAST, please cite it using the metadata below."
+title: "OpenUltraSAST"
+type: software
+authors:
+  - family-names: "Ciepluch"
+    given-names: "M"
+version: "2.1.0-alpha.1"
+date-released: 2026-11-06
+abstract: >-
+  An experimental static security analyser for evidence-gated analysis of
+  repositories and Git pushes, including pattern rules, syntax overlays, code
+  property graphs, and optional model-assisted decisions.
+keywords:
+  - "static application security testing"
+  - "static analysis"
+  - "software security"
+  - "SAST"
+license: "Apache-2.0"
+repository-code: "https://github.com/norandom/OpenUltraSAST"
+url: "https://norandom.github.io/OpenUltraSAST/"