🔧(tools) update OpenSpec skills and commands

Update all OpenSpec OPSX skills and commands definitions
to their latest versions.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/commands/opsx/new.md

@@ -25,7 +25,6 @@ Start a new change using the experimental artifact-driven approach.
    Use the default schema (omit `--schema`) unless the user explicitly requests a different workflow.
 
    **Use a different schema only if the user mentions:**
-   - "tdd" or "test-driven" → use `--schema tdd`
    - A specific schema name → use `--schema <name>`
    - "show workflows" or "what workflows" → run `openspec schemas --json` and let them choose