Fix spec-drift false positives from date-only description changes (#49)

* Initial plan

* fix: update vendored spec date and ignore date-only drifts in spec-drift workflow

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* fix: revert openapi.json date change — only spec-drift.yml needs updating

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* fix: simplify date-strip to inline sed on the existing one-liner

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* fix: DRY up spec-drift diff step with norm() helper

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* fix: use perl -pe instead of sed in norm() helper

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* fix: use jq -S with inline gsub instead of python json.tool + perl

* fix: replace gsub with del(.info.description) in norm()

---------

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Author: Copilot

.github/workflows/spec-drift.yml

@@ -25,7 +25,8 @@ jobs:
       - name: Check for drift
         id: drift
         run: |
-          if ! diff -u --label vendored --label upstream <(python3 -m json.tool --sort-keys openapi.json) <(python3 -m json.tool --sort-keys /tmp/latest-spec.json) > /tmp/spec.diff; then
+          norm() { jq -S 'del(.info.description)' "$1"; }
+          if ! diff -u --label vendored --label upstream <(norm openapi.json) <(norm /tmp/latest-spec.json) > /tmp/spec.diff; then
             echo "drifted=true" >> "$GITHUB_OUTPUT"
           fi
       - name: Open or update issue