test(llm): add tests for _augment_outline_with_ids with frontmatter

[twaugh]

Add comprehensive unit tests for _augment_outline_with_ids() to verify it correctly handles:

• Simple journal entries without frontmatter
• Journals with frontmatter (date, tags properties)
• Nested block hierarchies
• Preservation of existing id:: properties

These tests prevent regressions when the logseq-outline-parser package is updated but not reinstalled in development environments. The function requires the updated generate_full_context() signature that accepts frontmatter as the fourth parameter.

Fixes TypeError when extracting from journals with frontmatter:
TypeError: generate_full_context() takes from 2 to 3 positional arguments
but 4 were given

Assisted-by: Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.69%. Comparing base (a1b63f5) to head (0edfa3b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #44   +/-   ##
=======================================
  Coverage   84.69%   84.69%           
=======================================
  Files          48       48           
  Lines        5137     5137           
=======================================
  Hits         4351     4351           
  Misses        786      786           

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