Avoid unnecessary workflows, improve check-links detection of Hugo site dir

[alexander-yevsyukov]

This PR delivers several improvements across migrate, the check-links workflow, and the check-links / pre-pr skills.

migrate script

1. Hugo site detection expanded — now checks config/hugo.{toml,yaml} and config/_default/hugo.{toml,yaml} in addition to the site root, matching the detection logic in the check-links workflow.

2. JVM detection made reliable — uses the presence of buildSrc/src/main/kotlin/io/spine/dependency as the marker instead of gradlew / build.gradle.kts, which can exist in non-JVM repos that wrap shell scripts in Gradle for convenience.

3. Script restructured for mixed projects — the previous binary if IS_HUGO_DOCS … else … fi assumed a repo is either Hugo or JVM. Repos such as validation are both. The script is now four independent, sequentially-executed sections (Common, .agents, .claude, Hugo-specific, JVM-specific), each guarded by its own flag. Both IS_HUGO_DOCS and IS_JVM can be true simultaneously, and each section applies the right operations for the detected combination.

check-links workflow

4. work_dir output added — the "Detect docs site" step now emits a work_dir output (either $dir/_preview or $dir) so that all downstream steps use the correct working directory for npm ci, hugo, and Lychee, regardless of whether the repo's Node/Hugo setup lives in a _preview/ subtree or at the site root.

5. Unused site_dir output removed — no downstream step referenced it; it is dropped to keep the step contract minimal.

6. YAML config subdir variants added — config/hugo.yaml and config/_default/hugo.yaml are now included in the detection loop alongside the TOML variants.

check-links skill

7. WORK_DIR detection added to step 0 — mirrors the workflow's _preview vs. site-root logic so that local pre-PR runs and CI use the same working directory.

8. All ${SITE_DIR}/_preview references replaced with ${WORK_DIR} — affects npm ci, hugo build, hugo server, Lychee invocation, path-mapping example, and the Notes section.

9. Config subdir detection aligned with the workflow — step 0 now checks the same six config paths.

pre-pr skill

10. Description corrected — the previous wording claimed "deps-only → skipped"; dependency files (*.kt/*.kts under buildSrc) match the code classifier and run ./gradlew build. The description now reads "code/deps → build".

Scripts

11. jq presence check added — scripts that use jq now verify it is installed and exit with a clear error if not.

[Copilot]

Pull request overview

This PR improves repo-type detection used by shared tooling so that GitHub workflows and the check-links job behave correctly across different Spine repository layouts (JVM vs Hugo-only docs sites).

Changes:

• Add a more reliable JVM/Gradle repository marker in migrate and gate workflow updates behind it.
• Enhance check-links workflow Hugo site detection to support additional Hugo config layouts and to choose the correct working directory (_preview/ vs site root).
• Refine the pre-pr skill description to reflect scope-dependent build/check behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
migrate	Adds JVM repo detection and conditionally updates JVM-specific GitHub workflows.
.github/workflows/check-links.yml	Improves Hugo site/config discovery and introduces work_dir to run Node/Hugo steps in the right directory.
.agents/skills/pre-pr/SKILL.md	Updates the skill description to better describe scope-based build/check behavior and invoked reviewers.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 5 changed files in this pull request and generated 3 comments.

Files not reviewed (2)

• .idea/live-templates/README.md: Language not supported
• .idea/misc.xml: Language not supported

[Copilot]

Pull request overview

Copilot reviewed 10 out of 13 changed files in this pull request and generated 1 comment.

Files not reviewed (3)

• .idea/live-templates/README.md: Language not supported
• .idea/live-templates/User.xml: Language not supported
• .idea/misc.xml: Language not supported

Comments suppressed due to low confidence (1)

migrate:159

• initialize .github copies the entire .github/ directory (including .github/workflows/*) into the target repo when it doesn't exist yet. Because workflow syncing is now gated behind IS_JVM, a non-JVM target with no pre-existing .github/ will still receive JVM-only workflows like detekt-code-analysis.yml / gradle-wrapper-validation.yml from this initial copy. Consider copying .github/ without workflows (or removing JVM workflows) when IS_JVM=false, and only populating .github/workflows inside the JVM-gated block.

    initialize .github

    echo "Updating Codecov settings"
    cp .codecov.yml ..