feat: add Gmail skill with rich HTML formatting guidance

[allenhutchison]

Summary

Add an agent skill for Gmail that provides rich text HTML email formatting guidance (closes #58) and establishes the skills architecture for the extension.

Changes

New

• skills/gmail/SKILL.md — Gmail skill with:
  • Rich HTML email formatting instructions (isHtml: true, supported tags, inline CSS, templates)
  • Gmail search syntax quick reference
  • Label management workflows (system vs custom labels)
  • Attachment download guidance
  • Threading and reply best practices

Modified

• workspace-server/WORKSPACE-Context.md — Removed Gmail-specific sections now covered by the skill; added cross-reference
• scripts/release.js — Added skills/ directory bundling (same pattern as commands/)

Testing

• All 400 existing tests pass
• Release archive verified to contain skills/gmail/SKILL.md
• Manually tested skill activation with email composition tasks

Closes #58

[gemini-code-assist]

Summary of Changes

Hello @allenhutchison, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the agent's capabilities for managing Gmail by introducing a dedicated skill. This new skill centralizes detailed instructions for composing rich HTML emails, performing advanced searches, managing labels, handling attachments, and maintaining email threads. The change also refactors existing documentation to point to this new skill, streamlining information access and ensuring the new skill is included in future releases.

Highlights

• New Gmail Skill: Introduced a comprehensive Gmail skill (skills/gmail/SKILL.md) providing detailed guidance on rich HTML email formatting, Gmail search syntax, label management, attachment downloading, and threading best practices.
• Documentation Centralization: Migrated Gmail-specific documentation from workspace-server/WORKSPACE-Context.md to the new dedicated Gmail skill document, improving organization and reducing redundancy.
• Release Process Update: Updated the release script (scripts/release.js) to include the new skills/ directory in the release archive, ensuring all skills are properly bundled.

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Changelog

• scripts/release.js
  • Added bundling of the skills directory into the release archive.
• skills/gmail/SKILL.md
  • Introduced a new skill document for Gmail, detailing rich HTML email formatting, search operators, label management, attachment handling, and threading best practices.
• workspace-server/WORKSPACE-Context.md
  • Removed redundant Gmail-specific guidelines that are now covered by the new Gmail skill.
  • Updated the Gmail section to reference the dedicated Gmail skill document.

Activity

• All 400 existing tests passed, ensuring no regressions were introduced.
• The release archive was manually verified to correctly contain the new skills/gmail/SKILL.md file.
• Manual testing confirmed successful activation of the new Gmail skill for email composition tasks.

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[gemini-code-assist]

Code Review

This pull request introduces a new 'skill' architecture by adding a detailed Gmail skill for rich HTML email formatting and other tasks. The changes include creating a new skill file, updating the release script to bundle skills, and refactoring the main context file to remove redundant information. This is a great architectural improvement that enhances modularity. I've found one minor issue in an HTML example within the new skill file.

[abhipatel12]

LGTM!