docs: add v3.38.0 release notes

[hannesrudolph]

Summary

Adds Roo Code v3.38.0 release notes and aligns documentation with the release changes.

Changes

• Add v3.38.0 release notes (includes hero image)
• Update update-notes index and sidebar navigation
• Update docs for slash command frontmatter mode
• Update Custom Tools docs for npm dependencies and per-tool .env
• Remove OpenRouter Transforms section from provider docs

---

Important

Adds v3.38.0 release notes, updates documentation for new features, and modifies sidebar to include the new release.

• Release Notes:
  • Adds v3.38.0.mdx with details on new features like Agent Skills, slash command improvements, and provider updates.
• Documentation Updates:
  • Updates custom-tools.md to include npm dependency support and per-tool .env file usage.
  • Updates slash-commands.mdx to document the new mode frontmatter field.
  • Removes OpenRouter Transforms section from openrouter.md.
• Sidebar:
  • Updates sidebars.ts to include version 3.38 in the release notes section.

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Project	Deployment	Review	Updated (UTC)
roo-code-docs	Ready	Preview, Comment	Dec 29, 2025 8:01pm

[roomote]

Oroocle   See task on Roo Cloud

Re-review complete. Previous nit is resolved.

• Custom Tools: repo-level .gitignore already ignores .env files; rephrase the “add .roo/tools/.env to .gitignore” guidance to avoid implying an extra ignore rule is required.

Previous reviews

• c28d6c1: Review #1

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[roomote]

Repo-level .gitignore already ignores .env files (so .roo/tools/.env is already covered). Consider rephrasing this to “ensure your .env is ignored” to avoid suggesting an extra ignore rule is required.

_{Fix it with Roo Code or mention @roomote and request a fix.}

[hannesrudolph]

@roomote go ahead and make that adjustment.

[roomote]

Fixaroo   See task on Roo Cloud

Fixed the reported issue. Build passed locally.

_{View commit | Revert commit}