fix(command): fix get-unpublished-changes shell injection bugs

- Change model to anthropic/claude-haiku-4
- Fix local-version: use node -p instead of broken sed pattern
- Fix commits/diff: use xargs -I{} pipeline instead of subshell

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

.opencode/command/get-unpublished-changes.md

@@ -0,0 +1,54 @@
+---
+description: Compare HEAD with the latest published npm version and list all unpublished changes
+model: anthropic/claude-haiku-4-5
+---
+
+<command-instruction>
+Analyze the unpublished changes since the last npm release and provide a structured summary.
+
+Your task:
+1. Review the context below (auto-injected via shell)
+2. Summarize changes grouped by type (feat, fix, refactor, docs, chore)
+3. Highlight breaking changes if any
+4. Suggest next version bump (major/minor/patch) based on conventional commits
+</command-instruction>
+
+<version-context>
+<published-version>
+!`npm view oh-my-opencode version 2>/dev/null || echo "not published"`
+</published-version>
+<local-version>
+!`node -p "require('./package.json').version" 2>/dev/null || echo "unknown"`
+</local-version>
+<latest-tag>
+!`git tag --sort=-v:refname | head -1 2>/dev/null || echo "no tags"`
+</latest-tag>
+</version-context>
+
+<git-context>
+<commits-since-release>
+!`npm view oh-my-opencode version 2>/dev/null | xargs -I{} git log "v{}"..HEAD --oneline 2>/dev/null || echo "no commits since release"`
+</commits-since-release>
+<diff-stat>
+!`npm view oh-my-opencode version 2>/dev/null | xargs -I{} git diff "v{}"..HEAD --stat 2>/dev/null || echo "no diff available"`
+</diff-stat>
+<files-changed-summary>
+!`npm view oh-my-opencode version 2>/dev/null | xargs -I{} git diff "v{}"..HEAD --stat 2>/dev/null | tail -1 || echo ""`
+</files-changed-summary>
+</git-context>
+
+<output-format>
+## Unpublished Changes (v{published} → HEAD)
+
+### Commits ({count})
+| Type | Scope | Description |
+|------|-------|-------------|
+| ... | ... | ... |
+
+### Files Changed
+{diff-stat summary}
+
+### Suggested Version Bump
+- **Recommendation**: {patch|minor|major}
+- **Reason**: {brief explanation}
+</output-format>