chore(deps): Update dependency npm:@fission-ai/openspec to v1.3.1 (#795)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

mise.toml

@@ -1,5 +1,5 @@
 [tools]
 node = "20"
 python = "3"
-"npm:@fission-ai/openspec" = "1.2.0"
+"npm:@fission-ai/openspec" = "1.3.1"
 "npm:happy-coder" = "0.13.1"