When attaching Obsidian notes, extract [[wikilinks]] from the note
content and resolve them to actual vault files. Linked notes are
attached as "obsidian_wikilink" type, bounded by remaining_tokens.
Supports both [[Note]] and [[Note|Display]] syntax.
Closes#102
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>