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

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

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+---
+name: add-or-update-skill
+description: Workflow command scaffold for add-or-update-skill in everything-claude-code.
+allowed_tools: ["Bash", "Read", "Write", "Grep", "Glob"]
+---
+
+# /add-or-update-skill
+
+Use this workflow when working on **add-or-update-skill** in `everything-claude-code`.
+
+## Goal
+
+Adds a new skill or updates an existing skill, including documentation and registration in manifests.
+
+## Common Files
+
+- `skills/*/SKILL.md`
+- `.agents/skills/*/SKILL.md`
+- `manifests/install-modules.json`
+- `manifests/install-components.json`
+- `AGENTS.md`
+- `README.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 modify SKILL.md in skills/<skill-name>/ or .agents/skills/<skill-name>/
+- Update manifests/install-modules.json and/or manifests/install-components.json to register the skill
+- Update AGENTS.md, README.md, and docs/zh-CN/AGENTS.md for documentation and agent tables
+- Optionally add or update reference files or assets under the skill directory
+
+## Notes
+
+- Treat this as a scaffold, not a hard-coded script.
+- Update the command if the workflow evolves materially.