Add massive neutrino support and improve CSV/CLI output

- Add neutrino mass parameter to SpectrumConfig and CLI interface
- Update PhaseSpace component to handle neutrino mass effects properly
- Update CSV headers to show basic endpoint and all transition types
- Add --csv-verbosity option to CLI with 'full' and 'concise' options
- Fix comparison plots to properly show linear scale variations
- Add comprehensive tests for neutrino mass functionality

.llm-wiki/wiki/sources/SRC-2026-05-27-004.md

@@ -0,0 +1,41 @@
+---
+type: source
+format: web
+source_id: SRC-2026-05-27-004
+raw_path: raw/sources/SRC-2026-05-27-004/extracted.md
+captured: 2026-05-27
+status: skeleton
+---
+
+# https://cea.hal.science/cea-04796921/file/PhysRevC.110.055503.pdf
+> _Original: [https://cea.hal.science/cea-04796921/file/PhysRevC.110.055503.pdf](https://cea.hal.science/cea-04796921/file/PhysRevC.110.055503.pdf)_
+
+## Summary
+
+[LLM: Replace with 2-3 paragraph summary of key content]
+
+> _Auto-preview: High precision measurement of the 99Tc 𝛽 spectrum Michael Paulsen, Philipp Ranitzsch, Martin Loidl, Matias Rodrigues, Karsten Kossert, Xavier Mougeot, Abhilasha Singh, Sylvain Leblond, J. Beyer, L. Bockhorn, et al. To cite this version: Michael Paulsen, Philipp Ranitzsch, Martin Loidl, Matias Rodrigues, Karsten Kossert, et al.. High preci- sion measurement of the 99Tc 𝛽 spectrum. Physical Review C, 2024, 110, 055503 (17 p.). ⟨10.1103/Phys- RevC.110.055503⟩. ⟨cea-04796921⟩ HAL Id: cea-04796921 ..._
+
+## Key Takeaways
+
+- [LLM: Most important point]
+- [LLM: Second important point]
+- [LLM: Third important point]
+
+## Entities Mentioned
+
+- [[entity-name]]
+
+## Concepts Mentioned
+
+- [[concept-name]]
+
+## Notable Quotes
+
+> [LLM: Important quote] — attribution
+
+## Source Packet
+
+- **ID:** `[[sources/SRC-2026-05-27-004]]`
+- **Extracted:** [raw/sources/SRC-2026-05-27-004/extracted.md](../raw/sources/SRC-2026-05-27-004/extracted.md)
+- **Manifest:** [raw/sources/SRC-2026-05-27-004/manifest.json](../raw/sources/SRC-2026-05-27-004/manifest.json)