Add opsx-fixup command for diverging change specs

.opencode/commands/opsx-fixup.md

@@ -0,0 +1,28 @@
+---
+description: Fixup diverging archived openspec change artifacts
+---
+
+Fixup archived openspec change artifacts in @openspec/changes/archive/ that have diverged from the codebase.
+
+For each archived change directory:
+1. Read the .md artifact
+2. Review related code to verify consistency
+3. Fix any mismatches (status, fields, missing links, etc.)
+
+Only run make-commit if changes were made, with a specific message like "Fixup: add missing X field to Y change".
+
+---
+
+**Steps**
+
+1. **For each archived openspec change**
+
+   Read the change artifact.
+
+   Go through the related code.
+
+   Correct the change artifact where needed.
+
+2. **Run make-commit if changes were made**
+
+   skill [name=make-commit] message: "Fixup: <specific fix>"