feat: auto-install dtasks skill to Claude/Codex/OpenCode on first run

[danielmrdev]

Description

Improve the installation experience by automatically detecting and installing the dtasks CLI skill to the user's agent platform.

Requirements

• Detection: Scan for installed agent CLIs:

  • Claude (~/.claude/ directory or claude command)
  • Codex (if applicable)
  • OpenCode (if applicable)
  • Other agent CLIs as they emerge

• User Consent: Before installing, ask the user:

  "Found Claude installed. Would you like to install the dtasks skill globally?"

  • If yes: proceed to install
  • If no: skip installation

• Installation Logic:

  • Determine correct skill path based on detected agent:
    • Claude: ~/.claude/skills/dtasks-cli/ (copy skills/dtasks-cli/ from repo)
    • Codex: TBD (determine equivalent path)
    • OpenCode: TBD (determine equivalent path)
  • Copy skill directory to the correct location
  • If skill already exists, overwrite silently

• Integration: Hook into the install phase (Makefile make install or setup script)

  • Should be automatic, non-blocking
  • If detection fails, installation fails gracefully (no error)

Acceptance Criteria

• Auto-detection works for Claude (at minimum)
• User is prompted for consent
• Skill is copied to correct platform-specific location
• Existing skills are overwritten without error
• Installation skips gracefully if platform not found
• All flows tested on macOS/Linux/Windows

Related

Improves UX by making the dtasks skill available globally after installation without manual steps.