feat: add everything-claude-code ECC bundle (.claude/commands/add-or-update-command.md)

.claude/commands/add-or-update-command.md

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+---
+name: add-or-update-command
+description: Workflow command scaffold for add-or-update-command in everything-claude-code.
+allowed_tools: ["Bash", "Read", "Write", "Grep", "Glob"]
+---
+
+# /add-or-update-command
+
+Use this workflow when working on **add-or-update-command** in `everything-claude-code`.
+
+## Goal
+
+Adds or updates a command file, often for new workflows, review flows, or agent orchestration.
+
+## Common Files
+
+- `commands/*.md`
+
+## Suggested Sequence
+
+1. Understand the current state and failure mode before editing.
+2. Make the smallest coherent change that satisfies the workflow goal.
+3. Run the most relevant verification for touched files.
+4. Summarize what changed and what still needs review.
+
+## Typical Commit Signals
+
+- Create or update a markdown file in commands/ (e.g., commands/<command>.md)
+- Document usage, purpose, and output in YAML frontmatter and markdown sections
+- Optionally update related documentation or test files
+
+## Notes
+
+- Treat this as a scaffold, not a hard-coded script.
+- Update the command if the workflow evolves materially.