Fix packaged skill coverage for install targets

[missflash]

Behavior before

• CLI accepted newer install targets
• package metadata did not fully include all required skill files
• packaged installs for some supported platforms were at risk of failing with missing-file errors

Behavior after

• all supported install targets have matching packaged skill assets
• tests now cover the full supported install matrix exposed by the CLI
• future regressions are more likely to be caught during test runs

Validation

Verified with:

• python3 -m compileall graphify tests
• direct install(platform=...) execution for:
  • claude
  • codex
  • opencode
  • claw
  • droid
  • trae
  • trae-cn
  • windows

pytest was not available in the current environment, so full test-suite execution was not run here.

Scope

This PR intentionally avoids broader refactors and only fixes the packaging/test gap needed to make supported
install targets consistent with shipped artifacts.

[Copilot]

Pull request overview

This PR closes a packaging/test gap between the CLI’s supported install(platform=...) targets and the skill markdown assets actually shipped in the Python package, reducing the chance of missing-file failures after install.

Changes:

• Added install routing tests for additional supported platforms (droid, trae, trae-cn, windows).
• Expanded the “all skill files exist in package” test to cover the full installable skill file set.
• Updated setuptools package-data to include the missing packaged skill asset (skill-trae.md).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/test_install.py	Adds coverage for newly supported install targets and asserts all required skill assets are present in the installed package.
pyproject.toml	Ensures skill-trae.md is included in the built distribution via tool.setuptools.package-data.

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[safishamsi]

Applied in v0.3.18. skill-trae.md is now included in pyproject.toml package-data alongside the other skill files. The test suite also has four new install tests covering droid, trae, trae-cn, and windows, and test_all_skill_files_exist_in_package now checks all seven skill files. Thanks for catching this.