fix: skip the navigation script tag during schema generation

[Zalaras]

What does this PR do?

Guards the navigation script tag in baseof.html with schemaGenerationMode, the same discriminator single.html, list.html and the schema generator already use.

Why is this change needed?

v0.24.0 (#127) made the navigation output format mandatory, with a hard errorf when the home page doesn't emit it. make frontmatter layers dependencies.config.yml, which sets outputs.home: [FrontmatterSchema]. Hugo replaces a kind's output list rather than merging it, so Navigation is gone, pages still render through baseof.html, and the build dies. Broke make frontmatter in all 12 modules with a dependencies.config.yml (CI: tech-factbook-docs run 32368806014; deploy was skipped, production unaffected).

Fixed in the theme rather than the 12 modules so schema generation doesn't render a nav tree it discards. errorf stays an error: the blob is now the only path to a sidebar, so a warning would deploy a nav-less docset silently.

How to test

Add a local replace for this branch, then in a module with a dependencies.config.yml:

rm -rf public && hugo --ignoreCache --gc --config config.yml,dependencies.config.yml  # was exit 1
rm -rf public && hugo --printPathWarnings

Both gates pass on tech-factbook-docs, span-handbook-docs, and presidium-docs-opensource.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR fixes make frontmatter builds by skipping inclusion of the navigation.js blob script tag when running in schemaGenerationMode, avoiding a hard failure when schema generation replaces outputs.home with only FrontmatterSchema.

Changes:

• Guard the navigation output format lookup and <script> tag in layouts/_default/baseof.html behind not .Site.Params.schemaGenerationMode.
• Improve the actionable errorf guidance when navigation output is missing outside schema generation.
• Add a changelog entry documenting the fix and its impact on frontmatter schema generation builds.

Reviewed changes

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

File	Description
layouts/_default/baseof.html	Skips nav script injection during schema generation while preserving the hard failure in normal renders.
CHANGELOG.md	Documents the schema-generation navigation guard fix.

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