chore(deps): keep the numpy >=1.20 floor (decline the 2.x bump)

.github/dependabot.yml

@@ -35,7 +35,14 @@ updates:
           - "minor"
           - "patch"
 
-  # ordvec-python declared Python deps (numpy). Grouped; no-op if nothing parseable.
+  # ordvec-python's only runtime dep is numpy, and its floor is a DELIBERATE
+  # broad/legacy-compatibility choice: ordvec is dep-light + abi3-py39, and
+  # rust-numpy 0.27 supports numpy 1.x AND 2.x at runtime, so we keep numpy
+  # >=1.20 (usable on Python 3.9 + numpy 1.x legacy stacks). Raising the floor to
+  # 2.x would drop those users (numpy 2.1+ also dropped Python 3.9) for zero gain
+  # — ordvec's speed is its Rust kernels; numpy is just the zero-copy array
+  # container. So `ignore` numpy to stop Dependabot re-proposing the floor bump.
+  # maturin (build dep) updates and security advisories still flow.
   - package-ecosystem: "pip"
     directory: "/ordvec-python"
     schedule:
@@ -48,6 +55,9 @@ updates:
         update-types:
           - "minor"
           - "patch"
+    ignore:
+      # Hold the broad numpy floor (see above); do not auto-raise it.
+      - dependency-name: "numpy"
 
   # fuzz/ is a workspace-EXCLUDED standalone crate (own Cargo.lock), nightly-only
   # cargo-fuzz tooling. Dev-only surface, low priority — group all, tight PR limit.