Add default root collection

[janezd]

No description provided.

[Copilot]

Pull request overview

Adds a synthesized default root collection so the site has a usable root listing even when no top-level index.md(x)/collection.md(x) file is present. parseCollection now falls back to a built-in # Notes content string for the root path, and updateRoot no longer guards on the existence of a root markdown file. A non-root collection without an index file still throws.

Changes:

• parseCollection falls back to a DefaultCollectionContent (# Notes) when no index file exists at the root, and otherwise throws for non-root paths.
• updateRoot unconditionally calls parseCollection([], []) instead of conditionally constructing the root collection.

Reviewed changes

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

File	Description
ingest/collection.ts	Adds a default root content fallback and explicit error for missing index in non-root collections.
ingest/updatePaths.ts	Always parses the root collection, relying on the new fallback behavior.

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