feat: initial OpenSpec skills + /opsx commands for ZCode
Port of @fission-ai/openspec@1.4.1 workflow templates into ZCode-native
skills and slash commands.
- 11 skills (skills/openspec-*/SKILL.md): auto-trigger + /skill force-load
- 11 commands (commands/opsx/*.md): /opsx:explore, /opsx:propose, /opsx:apply,
/opsx:sync, /opsx:archive, /opsx:new, /opsx:continue, /opsx:ff, /opsx:verify,
/opsx:bulk-archive, /opsx:onboard
- install.sh / install.ps1 (idempotent, copies to ~/.zcode/)
- uninstall.sh / uninstall.ps1
- README.md with command table, install/update/uninstall, upstream mapping
Skill instruction text is ported verbatim from the upstream
get…SkillTemplate().instructions fields, with three ZCode adaptations:
1. /opsx:<cmd> cross-refs inside skill bodies → /skill openspec-<name>
2. Task tool → Agent tool (one occurrence in openspec-archive-change)
3. Source-version comment header in each SKILL.md
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