Change the commands from vibepaper to copaper and add github pages

[OwenWangbattle]

Prepare CoPaper for Open Source Release

Summary

This PR prepares the project for the pre-open-source release by renaming the public-facing project from VibePaper to CoPaper/Copaper, updating commands and package names, synchronizing skills and scaffold assets, and adding a GitHub Pages documentation site.

The branch analyzed locally is pre-opensource, compared against feature/opencode-plugin-mvp.

What Changed

Rename VibePaper to CoPaper

• Renamed the Python package directory from vibepaper/ to copaper/.
• Updated Python imports, CLI entry points, tests, docs, and scaffold references.
• Updated the CLI command from vibe to copaper.
• Updated environment variables from VIBEPAPER_* to COPAPER_*.
• Updated package metadata in pyproject.toml and editable package metadata.

Rename the OpenCode plugin

• Renamed the npm package from @vibepaper/opencode to @copaper/opencode.
• Renamed the binary from vibepaper-opencode to copaper-opencode.
• Renamed plugin tools from vibepaper_* to copaper_*.
• Renamed subagents from @vibepaper-* to @copaper-*.
• Renamed managed slash commands from /vibe* to /copaper*.
• Renamed project override config from .opencode/vibepaper.json to .opencode/copaper.json.

Update skills and scaffold

• Renamed vibepaper-manage to copaper-manage.
• Updated skill instructions to use CoPaper naming, copaper_* tools, and @copaper-* subagents.
• Synchronized source skills under .agents/skills/ with scaffolded copies under copaper/scaffold/skills/.
• Updated writing rules, AGENTS guidance, workflow docs, and codemap references.

Add GitHub Pages documentation

• Added docs/index.md from the Chinese usage guide.
• Added docs/en.md from the English usage guide.
• Added mkdocs.yml for a MkDocs Material documentation site.
• Added docs/requirements.txt for documentation dependencies.
• Added .github/workflows/docs.yml to deploy docs with GitHub Pages.

Update tests and documentation

• Updated Python tests to import and invoke copaper.
• Updated OpenCode plugin tests to expect @copaper/opencode, copaper-opencode, copaper_* tools, and @copaper-* agents.
• Updated README, usage docs, acceptance checklist, codemaps, and OpenCode plugin docs.

Testing

Suggested validation commands:

.venv/bin/pytest

cd packages/opencode-plugin
bun run typecheck
bun test
bun run build

git diff --check

Optional docs preview:

pip install -r docs/requirements.txt
mkdocs serve

Notes

• This PR intentionally does not keep backward-compatible aliases for the old vibe, vibepaper_*, or @vibepaper/* names.
• GitHub Pages should be enabled with Settings -> Pages -> Source -> GitHub Actions.
• The generated site will serve the Chinese guide as the homepage and the English guide at /en/.

[OwenWangbattle]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Resolved and pushed in 67f132d (merge conflict resolution commit). I also pushed 630eb9e to update remaining vibe command references introduced during the merge.