refactor: skip gh CLI upgrade when already at minimum version for skill support

[Copilot]

The skill installation step unconditionally ran install_gh_cli.sh (full apt-get upgrade) on every workflow run, even when the runner's gh was already new enough. This is wasteful and slow.

Changes

• pkg/constants/version_constants.go — added GhSkillsMinVersion = "2.90.0", the minimum gh version required for gh extension install (frontmatter skill support).

• pkg/workflow/compiler_activation_job_builder.go — the generated bash step now checks the current version first and only invokes install_gh_cli.sh when below the minimum. The REQUIRED variable and error message both derive from GhSkillsMinVersion; no hardcoded version strings remain.

Before (always upgrades):

bash "${RUNNER_TEMP}/gh-aw/actions/install_gh_cli.sh"
GH_VERSION=$(gh --version | awk 'NR==1 {print $3}')
REQUIRED="2.90.0"
if ! printf '%s\n%s\n' "$REQUIRED" "$GH_VERSION" | sort -V -C; then
  echo "::error::..." && exit 1
fi

After (upgrades only when needed):

REQUIRED="2.90.0"
GH_VERSION=$(gh --version | awk 'NR==1 {print $3}')
if ! printf '%s\n%s\n' "$REQUIRED" "$GH_VERSION" | sort -V -C; then
  bash "${RUNNER_TEMP}/gh-aw/actions/install_gh_cli.sh"
  GH_VERSION=$(gh --version | awk 'NR==1 {print $3}')
  if ! printf '%s\n%s\n' "$REQUIRED" "$GH_VERSION" | sort -V -C; then
    echo "::error::..." && exit 1
  fi
fi

[Copilot]

Pull request overview

This PR optimizes activation-job generation for frontmatter skill installation by avoiding an unconditional GitHub CLI (gh) upgrade on every run, and instead only upgrading when the installed gh is below the minimum required for skill support.

Changes:

• Added a single source of truth (constants.GhSkillsMinVersion) for the minimum gh version required for frontmatter skill support.
• Updated the activation job’s “Upgrade gh CLI for frontmatter skills” step to version-check first and only run the installer when the runner’s gh is older than the required minimum.

Show a summary per file

File	Description
pkg/constants/version_constants.go	Adds GhSkillsMinVersion constant for minimum gh skill-support version.
pkg/workflow/compiler_activation_job_builder.go	Updates generated bash step to conditionally run the gh upgrade based on current version.

Review details

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• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Low