Fix preset skill description precedence

[WOLIKIMCHENG]

Summary

• Preserve preset command frontmatter descriptions when registering preset-generated skills
• Add a regression test for a speckit.taskstoissues core command override

Fixes #2528

Tests

• UV_CACHE_DIR=/tmp/uv-cache-spec-kit uv run pytest tests/test_presets.py::TestPresetSkills::test_core_command_override_skill_uses_preset_command_description -q
• UV_CACHE_DIR=/tmp/uv-cache-spec-kit uv run pytest tests/test_presets.py::TestPresetSkills -q
• git diff --check -- src/specify_cli/presets.py tests/test_presets.py

[Copilot]

Pull request overview

This PR fixes a precedence bug in preset-generated SKILL.md creation so that when a preset overrides a core command, the propagated skill description comes from the preset command’s frontmatter (instead of being overwritten by the hardcoded SKILL_DESCRIPTIONS fallback). It also adds a regression test to prevent the speckit.taskstoissues override case from breaking again.

Changes:

• Update preset skill registration to prefer command frontmatter description and only fall back to SKILL_DESCRIPTIONS when no description is provided.
• Add a regression test ensuring a preset override of speckit.taskstoissues keeps the preset command description in the generated skill file.

Show a summary per file

File	Description
src/specify_cli/presets.py	Adjusts description selection logic during preset skill registration to respect preset command frontmatter precedence.
tests/test_presets.py	Adds a regression test covering core command override skill description precedence for taskstoissues.

Copilot's findings

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• Files reviewed: 2/2 changed files
• Comments generated: 1

[mnriem]

Please address Copilot feedback

[WOLIKIMCHENG]

Thanks for the review — I updated the restore/reconcile paths so they preserve command frontmatter descriptions before falling back to SKILL_DESCRIPTIONS, and added regression coverage for both cases.