Please turn this PDF into a knowledge entry.

Requirements:
1. Evaluate whether the PDF is worth saving
2. Classify it by primary purpose, not by the fact that it is a PDF
3. Choose the most suitable category:
   - official docs, commands, specs, or durable references -> `01_reference`
   - tutorials, explanations, or study material -> `02_learning`
   - project-specific plans, decisions, or notes -> `03_projects`
   - comparisons, analysis, or investigations -> `04_research`
   - uncertain classification -> `00_inbox`
4. Choose the most suitable template:
   - `templates/project-entry.md` for project-specific content
   - `templates/research-entry.md` for comparison, evaluation, or investigation content
   - `templates/reference-entry.md` for stable reference-like material
   - `templates/default-entry.md` otherwise
5. If classification confidence is medium, save it to `knowledge/00_inbox/` and note the most likely destination
6. If classification confidence is low, do not force a permanent category
7. Use a clean kebab-case filename
8. Output:
   - the chosen category
   - the selected template
   - the final save path
   - the filename
   - the structured Markdown entry
