v0.13.1

Changed

• Fixed: specsync -change <slug> (and slug-based links.md entries) failed to resolve a change after openspec archive renamed its folder with a date prefix. Archived changes now resolve by their original slug — locally, across links.md, and via live GitHub lookup with no ref cache — so a sync run after archiving correctly projects the terminal archived stage instead of erroring or, worse, silently missing the issue and creating a duplicate. (#128)