docs(skills): align doc-mirror-sync docs-only guidance

- Add docs-only sync mode rules (no version bump, no release actions).

- Add EN-only and EN+ZH sync command examples.

- Keep .github and .gemini skill instructions in sync.

.gemini/skills/doc-mirror-sync/SKILL.md

@@ -8,7 +8,43 @@ description: Automatically synchronizes plugin READMEs to the official documenta
 ## Overview
 Automates the mirroring of `plugins/{type}/{name}/README.md` to `docs/plugins/{type}/{name}.md`.
 
+## Docs-Only Mode (No Release Changes)
+Use this mode when the request is "only sync docs".
+
+- Only update documentation mirror files under `docs/plugins/**`.
+- Do **not** bump plugin version.
+- Do **not** modify plugin code (`plugins/**.py`) unless explicitly requested.
+- Do **not** update root badges/dates for release.
+- Do **not** run release preparation steps.
+
 ## Workflow
 1. Identify changed READMEs.
 2. Copy content to corresponding mirror paths.
 3. Update version badges in `docs/plugins/{type}/index.md`.
+
+## Commands
+
+### Sync all mirrors (EN + ZH)
+
+```bash
+python .github/skills/doc-mirror-sync/scripts/sync.py
+```
+
+### Sync only one plugin (EN only)
+
+```bash
+cp plugins/<type>/<name>/README.md docs/plugins/<type>/<name>.md
+```
+
+### Sync only one plugin (EN + ZH)
+
+```bash
+cp plugins/<type>/<name>/README.md docs/plugins/<type>/<name>.md
+cp plugins/<type>/<name>/README_CN.md docs/plugins/<type>/<name>.zh.md
+```
+
+## Notes
+
+- If asked for English-only update, sync only `README.md` -> `.md` mirror.
+- If both languages are requested, sync both `README.md` and `README_CN.md`.
+- After syncing, verify git diff only contains docs file changes.

.github/skills/doc-mirror-sync/SKILL.md

@@ -8,7 +8,43 @@ description: Automatically synchronizes plugin READMEs to the official documenta
 ## Overview
 Automates the mirroring of `plugins/{type}/{name}/README.md` to `docs/plugins/{type}/{name}.md`.
 
+## Docs-Only Mode (No Release Changes)
+Use this mode when the request is "only sync docs".
+
+- Only update documentation mirror files under `docs/plugins/**`.
+- Do **not** bump plugin version.
+- Do **not** modify plugin code (`plugins/**.py`) unless explicitly requested.
+- Do **not** update root badges/dates for release.
+- Do **not** run release preparation steps.
+
 ## Workflow
 1. Identify changed READMEs.
 2. Copy content to corresponding mirror paths.
 3. Update version badges in `docs/plugins/{type}/index.md`.
+
+## Commands
+
+### Sync all mirrors (EN + ZH)
+
+```bash
+python .github/skills/doc-mirror-sync/scripts/sync.py
+```
+
+### Sync only one plugin (EN only)
+
+```bash
+cp plugins/<type>/<name>/README.md docs/plugins/<type>/<name>.md
+```
+
+### Sync only one plugin (EN + ZH)
+
+```bash
+cp plugins/<type>/<name>/README.md docs/plugins/<type>/<name>.md
+cp plugins/<type>/<name>/README_CN.md docs/plugins/<type>/<name>.zh.md
+```
+
+## Notes
+
+- If asked for English-only update, sync only `README.md` -> `.md` mirror.
+- If both languages are requested, sync both `README.md` and `README_CN.md`.
+- After syncing, verify git diff only contains docs file changes.